#ifndef LOCAL
#define FAST_IO
#endif

// ============
#include <bits/stdc++.h>
#define OVERRIDE(a, b, c, d, ...) d
#define REP2(i, n) for (i32 i = 0; i < (i32)(n); ++i)
#define REP3(i, m, n) for (i32 i = (i32)(m); i < (i32)(n); ++i)
#define REP(...) OVERRIDE(__VA_ARGS__, REP3, REP2)(__VA_ARGS__)
#define PER2(i, n) for (i32 i = (i32)(n)-1; i >= 0; --i)
#define PER3(i, m, n) for (i32 i = (i32)(n)-1; i >= (i32)(m); --i)
#define PER(...) OVERRIDE(__VA_ARGS__, PER3, PER2)(__VA_ARGS__)
#define ALL(x) begin(x), end(x)
#define LEN(x) (i32)(x.size())
using namespace std;
using u32 = unsigned int;
using u64 = unsigned long long;
using i32 = signed int;
using i64 = signed long long;
using f64 = double;
using f80 = long double;
using pi = pair<i32, i32>;
using pl = pair<i64, i64>;
template <typename T>
using V = vector<T>;
template <typename T>
using VV = V<V<T>>;
template <typename T>
using VVV = V<V<V<T>>>;
template <typename T>
using VVVV = V<V<V<V<T>>>>;
template <typename T>
using PQR = priority_queue<T, V<T>, greater<T>>;
template <typename T>
bool chmin(T &x, const T &y) {
    if (x > y) {
        x = y;
        return true;
    }
    return false;
}
template <typename T>
bool chmax(T &x, const T &y) {
    if (x < y) {
        x = y;
        return true;
    }
    return false;
}
template <typename T>
i32 lob(const V<T> &arr, const T &v) {
    return (i32)(lower_bound(ALL(arr), v) - arr.begin());
}
template <typename T>
i32 upb(const V<T> &arr, const T &v) {
    return (i32)(upper_bound(ALL(arr), v) - arr.begin());
}
template <typename T>
V<i32> argsort(const V<T> &arr) {
    V<i32> ret;
    iota(ALL(ret), 0);
    sort(ALL(ret), [&](i32 i, i32 j) -> bool {
        if (arr[i] == arr[j]) {
            return i < j;
        } else {
            return arr[i] < arr[j];
        }
    });
    return ret;
}
#ifdef INT128
using u128 = __uint128_t;
using i128 = __int128_t;
istream &operator>>(istream &is, i128 &x) {
    i64 v;
    is >> v;
    x = v;
    return is;
}
ostream &operator<<(ostream &os, i128 x) {
    os << (i64)x;
    return os;
}
istream &operator>>(istream &is, u128 &x) {
    u64 v;
    is >> v;
    x = v;
    return is;
}
ostream &operator<<(ostream &os, u128 x) {
    os << (u64)x;
    return os;
}
#endif
[[maybe_unused]] constexpr i32 INF = 1000000100;
[[maybe_unused]] constexpr i64 INF64 = 3000000000000000100;
struct SetUpIO {
    SetUpIO() {
#ifdef FAST_IO
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
#endif
        cout << fixed << setprecision(15);
    }
} set_up_io;
void scan(char &x) { cin >> x; }
void scan(u32 &x) { cin >> x; }
void scan(u64 &x) { cin >> x; }
void scan(i32 &x) { cin >> x; }
void scan(i64 &x) { cin >> x; }
void scan(string &x) { cin >> x; }
template <typename T>
void scan(V<T> &x) {
    for (T &ele : x) {
        scan(ele);
    }
}
void read() {}
template <typename Head, typename... Tail>
void read(Head &head, Tail &...tail) {
    scan(head);
    read(tail...);
}
#define CHAR(...) string __VA_ARGS__; read(__VA_ARGS__);
#define U32(...) u32 __VA_ARGS__; read(__VA_ARGS__);
#define U64(...) u64 __VA_ARGS__; read(__VA_ARGS__);
#define I32(...) i32 __VA_ARGS__; read(__VA_ARGS__);
#define I64(...) i64 __VA_ARGS__; read(__VA_ARGS__);
#define STR(...) string __VA_ARGS__; read(__VA_ARGS__);
#define VEC(type, name, size) V<type> name(size); read(name);
#define VVEC(type, name, size1, size2) VV<type> name(size1, V<type>(size2)); read(name);
// ============

#ifdef DEBUGF
#else
#define DBG(x) (void) 0
#endif

// ============

#include <algorithm>
#include <cassert>
#include <utility>
#include <vector>

class HeavyLightDecomposition {
    std::vector<int> siz;
    std::vector<int> par;
    std::vector<int> hea;
    std::vector<int> in;
    std::vector<int> out;
    std::vector<int> dep;
    std::vector<int> rev;

    template <typename G>
    void dfs1(G &g, int v) {
        if (!g[v].empty() && (int) g[v][0] == par[v]) {
            std::swap(g[v][0], g[v].back());
        }
        for (auto &e : g[v]) {
            int u = (int)e;
            if (u != par[v]) {
                par[u] = v;
                dfs1(g, u);
                siz[v] += siz[u];
                if (siz[u] > siz[(int) g[v][0]]) {
                    std::swap(g[v][0], e);
                }
            }
        }
    }

    template <typename G>
    void dfs2(const G &g, int v, int &time) {
        in[v] = time;
        rev[time++] = v;
        for (auto &e : g[v]) {
            int u = (int)e;
            if (u == par[v]) {
                continue;
            }
            if (u == (int) g[v][0]) {
                hea[u] = hea[v];
            } else {
                hea[u] = u;
            }
            dep[u] = dep[v] + 1;
            dfs2(g, u, time);
        }
        out[v] = time;
    }

public:
    template <typename G>
    HeavyLightDecomposition(G &g, int root = 0) :
        siz(g.size(), 1),
        par(g.size(), root),
        hea(g.size(), root),
        in(g.size(), 0),
        out(g.size(), 0),
        dep(g.size(), 0),
        rev(g.size(), 0) {
        assert(root >= 0 && root < (int) g.size());
        dfs1(g, root);
        int time = 0;
        dfs2(g, root, time);
    }

    int subtree_size(int v) const {
        assert(v >= 0 && v < (int) siz.size());
        return siz[v];
    }

    int parent(int v) const {
        assert(v >= 0 && v < (int) par.size());
        return par[v];
    }

    int in_time(int v) const {
        assert(v >= 0 && v < (int) in.size());
        return in[v];
    }

    int out_time(int v) const {
        assert(v >= 0 && v < (int) out.size());
        return out[v];
    }

    int depth(int v) const {
        assert(v >= 0 && v < (int) dep.size());
        return dep[v];
    }

    int time_to_vertex(int t) const {
        assert(t >= 0 && t < (int) rev.size());
        return rev[t];
    }
    
    int head(int v) const {
        assert(v >= 0 && v < (int) out.size());
        return hea[v];
    }
    
    int la(int v, int k) const {
        assert(v >= 0 && v < (int) dep.size());
        assert(k >= 0);
        if (k > dep[v]) {
            return -1;
        }
        while (true) {
            int u = hea[v];
            if (in[u] + k <= in[v]) {
                return rev[in[v] - k];
            }
            k -= in[v] - in[u] + 1;
            v = par[u];
        }
        return 0;
    }
    
    int forward(int v, int dst) const {
        assert(v >= 0 && v < (int) dep.size());
        assert(dst >= 0 && dst < (int) dep.size());
        assert(v != dst);
        int l = lca(v, dst);
        if (l == v) {
            return la(dst, dep[dst] - dep[v] - 1);
        } else {
            return par[v];
        }
    }

    int lca(int u, int v) const {
        assert(u >= 0 && u < (int) dep.size());
        assert(v >= 0 && v < (int) dep.size());
        while (u != v) {
            if (in[u] > in[v]) {
                std::swap(u, v);
            }
            if (hea[u] == hea[v]) {
                v = u;
            } else {
                v = par[hea[v]];
            }
        }
        return u;
    }

    int dist(int u, int v) const {
        assert(u >= 0 && u < (int) dep.size());
        assert(v >= 0 && v < (int) dep.size());
        return dep[u] + dep[v] - 2 * dep[lca(u, v)];
    }

    std::vector<std::pair<int, int>> path(int u, int v, bool edge) const {
        assert(u >= 0 && u < (int) dep.size());
        assert(v >= 0 && v < (int) dep.size());
        std::vector<std::pair<int, int>> fromu, fromv;
        bool rev = false;
        while (true) {
            if (u == v && edge) {
                break;
            }
            if (in[u] > in[v]) {
                std::swap(u, v);
                std::swap(fromu, fromv);
                rev ^= true;
            }
            if (hea[u] == hea[v]) {
                fromv.emplace_back(in[v], in[u] + (int)edge);
                v = u;
                break;
            } else {
                fromv.emplace_back(in[v], in[hea[v]]);
                v = par[hea[v]];
            }
        }
        if (rev) {
            std::swap(fromu, fromv);
        }
        std::reverse(fromv.begin(), fromv.end());
        fromu.reserve(fromv.size());
        for (auto [x, y] : fromv) {
            fromu.emplace_back(y, x);
        }
        return fromu;
    }
    
    int jump(int u, int v, int k) const {
        assert(u >= 0 && u < (int) dep.size());
        assert(v >= 0 && v < (int) dep.size());
        assert(k >= 0);
        int l = lca(u, v);
        int dis = dep[u] + dep[v] - 2 * dep[l];
        if (k > dis) {
            return -1;
        }
        if (k <= dep[u] - dep[l]) {
            return la(u, k);
        } else {
            return la(v, dis - k);
        }
    }
    
    int meet(int u, int v, int w) const {
        return lca(u, v) ^ lca(v, w) ^ lca(w, u);
    }
};

// ============

// ============
#include <atcoder/convolution>
#include <compare>
#include <iostream>
#include <string>

class BigInt {
    static constexpr long long B = 1000000;
    static constexpr int L = 6;
    // a >= 0
    static void normalize(std::vector<long long> &a) {
        if (a.empty()) {
            return;
        }
        for (int i = 0; i < (int)a.size() - 1; ++i) {
            if (a[i] < 0) {
                long long v = (-a[i] + B - 1) / B;
                a[i] += v * B;
                a[i + 1] -= v;
            }
            if (a[i] >= B) {
                long long v = a[i] / B;
                a[i] -= v * B;
                a[i + 1] += v;
            }
        }
        while (a.back() >= B) {
            long long v = a.back() / B;
            a.back() -= v * B;
            a.push_back(v);
        }
        while (!a.empty() && a.back() == 0) {
            a.pop_back();
        }
    }
    static std::vector<long long> nn_add(const std::vector<long long> &lhs, const std::vector<long long> rhs) {
        std::vector<long long> ret(std::max(lhs.size(), rhs.size()), 0);
        for (int i = 0; i < (int)lhs.size(); ++i) {
            ret[i] += lhs[i];
        }
        for (int i = 0; i < (int)rhs.size(); ++i) {
            ret[i] += rhs[i];
        }
        normalize(ret);
        return ret;
    }
    // lhs >= rhs
    static std::vector<long long> nn_sub(const std::vector<long long> &lhs, const std::vector<long long> rhs) {
        std::vector<long long> ret(lhs.size(), 0);
        for (int i = 0; i < (int)lhs.size(); ++i) {
            ret[i] += lhs[i];
        }
        for (int i = 0; i < (int)rhs.size(); ++i) {
            ret[i] -= rhs[i];
        }
        normalize(ret);
        return ret;
    }
    static std::vector<long long> nn_mul(const std::vector<long long> &lhs, const std::vector<long long> rhs) {
        std::vector<long long> ret = atcoder::convolution_ll(lhs, rhs);
        normalize(ret);
        return ret;
    }
    static std::strong_ordering cmp(const std::vector<long long> &lhs, const std::vector<long long> &rhs) {
        if (lhs.size() != rhs.size()) {
            return lhs.size() <=> rhs.size();
        } else {
            for (int i = (int)lhs.size() - 1; i >= 0; --i) {
                if (lhs[i] != rhs[i]) {
                    return lhs[i] <=> rhs[i];
                }
            }
            return std::strong_ordering::equivalent;
        }
    }
    
    std::vector<long long> expr;
    bool pos;
    
    BigInt(std::vector<long long> expr, bool pos) : expr(expr), pos(pos) {}
public:
    BigInt() : expr(), pos(true) {}
    BigInt(long long x) : expr(), pos(true) {
        if (x < 0) {
            pos = false;
            x = -x;
        }
        while (x > 0) {
            expr.push_back(x % B);
            x /= B;
        }
    }
    // [0-9]*
    BigInt(const std::string &s) : expr(), pos(true) {
        int cur = (int)s.size();
        while (cur > 0) {
            int nx = std::max(0, cur - 6);
            long long val = 0;
            long long p = 1;
            for (int i = cur - 1; i >= nx; --i) {
                val += p * (s[i] - '0');
                p *= 10;
            }
            expr.push_back(val);
            cur = nx;
        }
    }
    int size() const {
        return (int)expr.size();
    }
    const BigInt operator-() const {
        return BigInt(expr, !pos);
    }
    BigInt &operator+=(const BigInt &rhs) {
        if (pos == rhs.pos) {
            expr = nn_add(expr, rhs.expr);
        } else {
            auto c = cmp(expr, rhs.expr);
            if (c > 0) {
                expr = nn_sub(expr, rhs.expr);
            } else if (c < 0) {
                expr = nn_sub(rhs.expr, expr);
                pos = !pos;
            } else {
                expr.clear();
            }
        }
        return *this;
    }
    BigInt &operator-=(const BigInt &rhs) {
        if (pos != rhs.pos) {
            expr = nn_add(expr, rhs.expr);
        } else {
            auto c = cmp(expr, rhs.expr);
            if (c > 0) {
                expr = nn_sub(expr, rhs.expr);
            } else if (c < 0) {
                expr = nn_sub(rhs.expr, expr);
                pos = !pos;
            } else {
                expr.clear();
            }
        }
        return *this;
    }
    BigInt &operator*=(const BigInt &rhs) {
        expr = nn_mul(expr, rhs.expr);
        pos ^= !rhs.pos;
        return *this;
    }
    friend BigInt operator+(BigInt lhs, const BigInt &rhs) {
        lhs += rhs;
        return lhs;
    }
    friend BigInt operator-(BigInt lhs, const BigInt &rhs) {
        lhs -= rhs;
        return lhs;
    }
    friend BigInt operator*(BigInt lhs, const BigInt &rhs) {
        lhs *= rhs;
        return lhs;
    }
    std::string to_string() const {
        if (expr.empty()) {
            return std::string("0");
        }
        std::string ret;
        if (!pos) {
            ret.push_back('-');
        }
        for (int i = (int)expr.size() - 1; i >= 0; --i) {
            std::string s = std::to_string(expr[i]);
            if (i != (int)expr.size() - 1) {
                s = std::string(6 - (int)s.size(), '0') + s;
            }
            ret += s;
        }
        return ret;
    }
};
std::istream &operator>>(std::istream &is, BigInt &v) {
    std::string s;
    is >> s;
    int p = 0;
    bool pos = true;
    while (p < (int)s.size() && s[p] == '-') {
        pos = !pos;
        ++p;
    }
    v = BigInt(s.substr(p));
    if (!pos) {
        v = -v;
    }
    return is;
}
std::ostream &operator<<(std::ostream &os, const BigInt &v) {
    os << v.to_string();
    return os;
}
// ============

template <typename Op>
typename Op::Value weighted_merge(const V<typename Op::Value> &vals) {
    using Val = typename Op::Value;
    auto rec = [&](auto rec, i32 l, i32 r) -> Val {
        if (r - l == 1) {
            return vals[l];
        }
        i32 s = 0;
        REP(i, l, r) {
            s += vals[i].size();
        }
        i32 c = 0;
        REP(i, l, r) {
            c += vals[i].size();
            if (2 * c >= s) {
                Val ret = vals[i];
                if (i != l) {
                    ret = Op::op(rec(rec, l, i), ret);
                }
                if (i != r - 1) {
                    ret = Op::op(ret, rec(rec, i + 1, r));
                }
                return ret;
            }
        }
        assert(false);
    };
    return rec(rec, 0, LEN(vals));
}

using bigint = BigInt;

struct Affine {
    bigint a, b;
    Affine() : a(1LL), b(0LL) {}
    Affine(bigint a, bigint b) : a(a), b(b) {}
    i32 size() const {
        return max(a.size(), b.size());
    }
};

struct Op {
    using Value = Affine;
    static Affine op(const Affine f, const Affine g) {
        return Affine(f.a * g.a, f.a * g.b + f.b);
    }
};

struct Parser {
    string s;
    i32 it;
    
    // results
    VV<i32> tree;
    V<bigint> val;
    V<char> op;
    i32 root;
    
    i32 new_node() {
        i32 v = LEN(tree);
        tree.push_back(V<i32>());
        val.push_back(bigint());
        op.push_back('!');
        return v;
    }
    i32 number() {
        bool pos = true;
        while (it < (i32)s.size() && s[it] == '-') {
            pos = !pos;
            ++it;
        }
        string d;
        while (it < (i32)s.size() && isdigit(s[it])) {
            d.push_back(s[it]);
            ++it;
        }
        i32 v = new_node();
        val[v] = bigint(d);
        if (!pos) {
            val[v] = -val[v];
        }
        return v;
    }
    i32 factor() {
        if (s[it] == '(') {
            ++it;
            i32 v = expr();
            assert(it < (i32)s.size() && s[it] == ')');
            ++it;
            return v;
        } else {
            i32 v = number();
            return v;
        }
    }
    i32 term() {
        i32 r = factor();
        while (it < (i32)s.size() && s[it] == '*') {
            ++it;
            i32 u = r;
            i32 v = factor();
            r = new_node();
            op[r] = '*';
            tree[r].push_back(u);
            tree[r].push_back(v);
        }
        return r;
    }
    i32 expr() {
        i32 r = term();
        while (it < (i32)s.size() && (s[it] == '+' || s[it] == '-')) {
            if (s[it] == '+') {
                ++it;
                i32 u = r;
                i32 v = term();
                r = new_node();
                op[r] = '+';
                tree[r].push_back(u);
                tree[r].push_back(v);
            } else {
                ++it;
                i32 v = term();
                // negate
                {
                    i32 m = new_node();
                    val[m] = bigint(-1LL);
                    i32 t = new_node();
                    op[t] = '*';
                    tree[t].push_back(v);
                    tree[t].push_back(m);
                    v = t;
                }
                // add
                i32 u = r;
                r = new_node();
                op[r] = '+';
                tree[r].push_back(u);
                tree[r].push_back(v);
            }
        }
        return r;
    }
    
    Parser(string s) : s(s), it(0), tree(), val(), op(), root(-1) {
        root = expr();
    }
};

// 末尾から適用する
bigint affine(const V<char> &op, const V<bigint> &val, const bigint &x) {
    assert(op.size() == val.size());
    /*bigint ans = x;
    PER(i, op.size()) {
        if (op[i] == '+') {
            ans += val[i];
        } else if (op[i] == '-') {
            ans -= val[i];
        } else {
            ans *= val[i];
        }
    }
    return ans;*/
    /*// x -> ax+b
    auto rec = [&](auto rec, i32 l, i32 r) -> pair<bigint, bigint> {
        if (r - l == 1) {
            if (op[l] == '+') {
                return pair<bigint, bigint>(bigint(1LL), val[l]);
            } else if (op[l] == '-') {
                return pair<bigint, bigint>(bigint(1LL), -val[l]);
            } else {
                return pair<bigint, bigint>(val[l], bigint());
            }
        }
        i32 mid = (l + r) / 2;
        auto [al, bl] = rec(rec, l, mid);
        auto [ar, br] = rec(rec, mid, r);
        return pair<bigint, bigint>(al * ar, al * br + bl);
    };
    auto [a, b] = rec(rec, 0, (i32)op.size());
    return a * x + b;*/
    V<Affine> funcs;
    REP(i, LEN(op)) {
        if (op[i] == '+') {
            funcs.emplace_back(Affine(bigint(1LL), val[i]));
        } else if (op[i] == '-') {
            funcs.emplace_back(Affine(bigint(1LL), -val[i]));
        } else {
            funcs.emplace_back(Affine(val[i], bigint(0LL)));
        }
    }
    Affine tot = weighted_merge<Op>(funcs);
    return tot.a * x + tot.b;
}

int main() {
    i32 n;
    cin >> n;
    string s;
    cin >> s;
    
    Parser parser(s);
    
    HeavyLightDecomposition hld(parser.tree, parser.root);
    V<i32> heavy(parser.tree.size(), -1), light(parser.tree.size(), -1);
    REP(i, parser.tree.size()) {
        if (parser.tree[i].empty()) {
            continue;
        }
        i32 u = parser.tree[i][0], v = parser.tree[i][1];
        if (hld.head(u) == u) {
            heavy[i] = v;
            light[i] = u;
        } else {
            heavy[i] = u;
            light[i] = v;
        }
    }
    
    auto solve = [&](auto solve, i32 v) -> bigint {
        if (heavy[v] == -1) {
            return parser.val[v];
        }
        V<char> op;
        V<bigint> val;
        i32 cur = v;
        while (heavy[cur] != -1) {
            op.push_back(parser.op[cur]);
            val.push_back(solve(solve, light[cur]));
            cur = heavy[cur];
        }
        return affine(op, val, solve(solve, cur));
    };
    cout << solve(solve, parser.root) << '\n';
}