#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <climits>
#include <cmath>
#include <complex>
#include <cstring>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <vector>
using namespace std;

using ll = long long;
using db = long double;  // or double, if TL is tight
using str = string;      // yay python!

// pairs
using pi = pair<int, int>;
using pl = pair<ll, ll>;
using pd = pair<db, db>;
#define mp make_pair
#define f first
#define s second

#define tcT template <class T
#define tcTU tcT, class U
// ^ lol this makes everything look weird but I'll try it
tcT > using V = vector<T>;
tcT, size_t SZ > using AR = array<T, SZ>;
using vi = V<int>;
using vb = V<bool>;
using vl = V<ll>;
using vd = V<db>;
using vs = V<str>;
using vpi = V<pi>;
using vpl = V<pl>;
using vpd = V<pd>;

// vectors
#define sz(x) int(size(x))
#define bg(x) begin(x)
#define all(x) bg(x), end(x)
#define rall(x) rbegin(x), rend(x)
#define sor(x) sort(all(x))
#define rsz resize
#define ins insert
#define pb push_back
#define eb emplace_back
#define ft front()
#define bk back()

#define lb lower_bound
#define ub upper_bound
tcT > int lwb(const V<T> &a, const T &b) { return int(lb(all(a), b) - bg(a)); }
tcT > int upb(const V<T> &a, const T &b) { return int(ub(all(a), b) - bg(a)); }

// loops
#define FOR(i, a, b) for (int i = (a); i < (b); ++i)
#define F0R(i, a) FOR(i, 0, a)
#define ROF(i, a, b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i, a) ROF(i, 0, a)
#define rep(a) F0R(_, a)
#define each(a, x) for (auto &a : x)

const int MOD = 998244353;  // 1e9+7;
const int MX = (int)2e5 + 5;
const ll BIG = 1e18;  // not too close to LLONG_MAX
const db PI = acos((db)-1);
const int dx[4]{1, 0, -1, 0}, dy[4]{0, 1, 0, -1};  // for every grid problem!!
mt19937 rng((uint32_t)chrono::steady_clock::now().time_since_epoch().count());
template <class T> using pqg = priority_queue<T, vector<T>, greater<T>>;

// bitwise ops
// also see https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html
constexpr int pct(int x) { return __builtin_popcount(x); }  // # of bits set
constexpr int bits(int x) {  // assert(x >= 0); // make C++11 compatible until
	                         // USACO updates ...
	return x == 0 ? 0 : 31 - __builtin_clz(x);
}  // floor(log2(x))
constexpr int p2(int x) { return 1 << x; }
constexpr int msk2(int x) { return p2(x) - 1; }

ll cdiv(ll a, ll b) {
	return a / b + ((a ^ b) > 0 && a % b);
}  // divide a by b rounded up
ll fdiv(ll a, ll b) {
	return a / b - ((a ^ b) < 0 && a % b);
}  // divide a by b rounded down

tcT > bool ckmin(T &a, const T &b) {
	return b < a ? a = b, 1 : 0;
}  // set a = min(a,b)
tcT > bool ckmax(T &a, const T &b) {
	return a < b ? a = b, 1 : 0;
}  // set a = max(a,b)

tcTU > T fstTrue(T lo, T hi, U f) {
	++hi;
	assert(lo <= hi);  // assuming f is increasing
	while (lo < hi) {  // find first index such that f is true
		T mid = lo + (hi - lo) / 2;
		f(mid) ? hi = mid : lo = mid + 1;
	}
	return lo;
}
tcTU > T lstTrue(T lo, T hi, U f) {
	--lo;
	assert(lo <= hi);  // assuming f is decreasing
	while (lo < hi) {  // find first index such that f is true
		T mid = lo + (hi - lo + 1) / 2;
		f(mid) ? lo = mid : hi = mid - 1;
	}
	return lo;
}
tcT > void remDup(vector<T> &v) {  // sort and remove duplicates
	sort(all(v));
	v.erase(unique(all(v)), end(v));
}
tcTU > void safeErase(T &t, const U &u) {
	auto it = t.find(u);
	assert(it != end(t));
	t.erase(it);
}

inline namespace IO {
#define SFINAE(x, ...)                                                         \
	template <class, class = void> struct x : std::false_type {};              \
	template <class T> struct x<T, std::void_t<__VA_ARGS__>> : std::true_type {}

SFINAE(DefaultI, decltype(std::cin >> std::declval<T &>()));
SFINAE(DefaultO, decltype(std::cout << std::declval<T &>()));
SFINAE(IsTuple, typename std::tuple_size<T>::type);
SFINAE(Iterable, decltype(std::begin(std::declval<T>())));

template <auto &is> struct Reader {
	template <class T> void Impl(T &t) {
		if constexpr (DefaultI<T>::value) is >> t;
		else if constexpr (Iterable<T>::value) {
			for (auto &x : t) Impl(x);
		} else if constexpr (IsTuple<T>::value) {
			std::apply([this](auto &...args) { (Impl(args), ...); }, t);
		} else static_assert(IsTuple<T>::value, "No matching type for read");
	}
	template <class... Ts> void read(Ts &...ts) { ((Impl(ts)), ...); }
};

template <class... Ts> void re(Ts &...ts) { Reader<cin>{}.read(ts...); }
#define def(t, args...)                                                        \
	t args;                                                                    \
	re(args);

template <auto &os, bool debug, bool print_nd> struct Writer {
	string comma() const { return debug ? "," : ""; }
	template <class T> constexpr char Space(const T &) const {
		return print_nd && (Iterable<T>::value or IsTuple<T>::value) ? '\n'
		                                                             : ' ';
	}
	template <class T> void Impl(T const &t) const {
		if constexpr (DefaultO<T>::value) os << t;
		else if constexpr (Iterable<T>::value) {
			if (debug) os << '{';
			int i = 0;
			for (auto &&x : t)
				((i++) ? (os << comma() << Space(x), Impl(x)) : Impl(x));
			if (debug) os << '}';
		} else if constexpr (IsTuple<T>::value) {
			if (debug) os << '(';
			std::apply(
			    [this](auto const &...args) {
				    int i = 0;
				    (((i++) ? (os << comma() << " ", Impl(args)) : Impl(args)),
				     ...);
			    },
			    t);
			if (debug) os << ')';
		} else static_assert(IsTuple<T>::value, "No matching type for print");
	}
	template <class T> void ImplWrapper(T const &t) const {
		if (debug) os << "\033[0;31m";
		Impl(t);
		if (debug) os << "\033[0m";
	}
	template <class... Ts> void print(Ts const &...ts) const {
		((Impl(ts)), ...);
	}
	template <class F, class... Ts>
	void print_with_sep(const std::string &sep, F const &f,
	                    Ts const &...ts) const {
		ImplWrapper(f), ((os << sep, ImplWrapper(ts)), ...), os << '\n';
	}
	void print_with_sep(const std::string &) const { os << '\n'; }
};

template <class... Ts> void pr(Ts const &...ts) {
	Writer<cout, false, true>{}.print(ts...);
}
template <class... Ts> void ps(Ts const &...ts) {
	Writer<cout, false, true>{}.print_with_sep(" ", ts...);
}
}  // namespace IO

inline namespace Debug {
template <typename... Args> void err(Args... args) {
	Writer<cerr, true, false>{}.print_with_sep(" | ", args...);
}
template <typename... Args> void errn(Args... args) {
	Writer<cerr, true, true>{}.print_with_sep(" | ", args...);
}

void err_prefix(str func, int line, string args) {
	cerr << "\033[0;31m\u001b[1mDEBUG\033[0m"
	     << " | "
	     << "\u001b[34m" << func << "\033[0m"
	     << ":"
	     << "\u001b[34m" << line << "\033[0m"
	     << " - "
	     << "[" << args << "] = ";
}

#ifdef LOCAL
#define dbg(args...) err_prefix(__FUNCTION__, __LINE__, #args), err(args)
#define dbgn(args...) err_prefix(__FUNCTION__, __LINE__, #args), errn(args)
#else
#define dbg(...)
#define dbgn(args...)
#endif

const auto beg_time = std::chrono::high_resolution_clock::now();
// https://stackoverflow.com/questions/47980498/accurate-c-c-clock-on-a-multi-core-processor-with-auto-overclock?noredirect=1&lq=1
double time_elapsed() {
	return chrono::duration<double>(std::chrono::high_resolution_clock::now() -
	                                beg_time)
	    .count();
}
}  // namespace Debug

inline namespace FileIO {
void setIn(str s) { freopen(s.c_str(), "r", stdin); }
void setOut(str s) { freopen(s.c_str(), "w", stdout); }
void setIO(str s = "") {
	cin.tie(0)->sync_with_stdio(0);  // unsync C / C++ I/O streams
	cout << fixed << setprecision(12);
	// cin.exceptions(cin.failbit);
	// throws exception when do smth illegal
	// ex. try to read letter into int
	if (sz(s)) setIn(s + ".in"), setOut(s + ".out");  // for old USACO
}
}  // namespace FileIO

#include <atcoder/convolution>
#include <string>
#include <vector>
const int DIGIT = 6;
const int BASE = 1000000;
struct positive_bigint {
	std::vector<int> d;
	positive_bigint() {}
	positive_bigint(long long X) {
		while (X > 0) {
			d.push_back(X % BASE);
			X /= BASE;
		}
	}
	positive_bigint(std::string S) {
		if (S == "0") { S = ""; }
		int L = S.size();
		d.resize((L + DIGIT - 1) / DIGIT, 0);
		for (int i = L - 1; i >= 0; i -= 6) {
			for (int j = std::max(i - 5, 0); j <= i; j++) {
				d[i / DIGIT] *= 10;
				d[i / DIGIT] += S[j] - '0';
			}
		}
		std::reverse(d.begin(), d.end());
	}
	bool empty() const { return d.empty(); }
	int size() const { return d.size(); }
	int &operator[](int i) { return d[i]; }
	int operator[](int i) const { return d[i]; }
};
std::string to_string(const positive_bigint &A) {
	int N = A.size();
	std::string ans;
	for (int i = N - 1; i >= 0; i--) {
		std::string tmp = std::to_string(A[i]);
		if (i < N - 1) { ans += std::string(DIGIT - tmp.size(), '0'); }
		ans += tmp;
	}
	if (ans.empty()) { ans = "0"; }
	return ans;
}
std::istream &operator>>(std::istream &is, positive_bigint &A) {
	std::string S;
	is >> S;
	A = positive_bigint(S);
	return is;
}
std::ostream &operator<<(std::ostream &os, positive_bigint &A) {
	os << to_string(A);
	return os;
}
int cmp(const positive_bigint &A, const positive_bigint &B) {
	int N = A.size();
	int M = B.size();
	if (N < M) {
		return -1;
	} else if (N > M) {
		return 1;
	} else {
		for (int i = N - 1; i >= 0; i--) {
			if (A[i] < B[i]) { return -1; }
			if (A[i] > B[i]) { return 1; }
		}
		return 0;
	}
}
bool operator==(const positive_bigint &A, const positive_bigint &B) {
	return cmp(A, B) == 0;
}
bool operator!=(const positive_bigint &A, const positive_bigint &B) {
	return cmp(A, B) != 0;
}
bool operator<(const positive_bigint &A, const positive_bigint &B) {
	return cmp(A, B) < 0;
}
bool operator>(const positive_bigint &A, const positive_bigint &B) {
	return cmp(A, B) > 0;
}
bool operator<=(const positive_bigint &A, const positive_bigint &B) {
	return cmp(A, B) <= 0;
}
bool operator>=(const positive_bigint &A, const positive_bigint &B) {
	return cmp(A, B) >= 0;
}
positive_bigint &operator+=(positive_bigint &A, const positive_bigint &B) {
	int N = A.size();
	int M = B.size();
	while (N < M) {
		A.d.push_back(0);
		N++;
	}
	for (int i = 0; i < M; i++) { A[i] += B[i]; }
	for (int i = 0; i < N - 1; i++) {
		if (A[i] >= BASE) {
			A[i] -= BASE;
			A[i + 1]++;
		}
	}
	if (N > 0) {
		if (A[N - 1] >= BASE) {
			A.d.push_back(1);
			A[N - 1] -= BASE;
		}
	}
	return A;
}
positive_bigint operator+(const positive_bigint &A, const positive_bigint &B) {
	positive_bigint A2 = A;
	A2 += B;
	return A2;
}
positive_bigint &operator-=(positive_bigint &A, const positive_bigint &B) {
	int N = A.size();
	int M = B.size();
	for (int i = 0; i < M; i++) { A[i] -= B[i]; }
	for (int i = 0; i < N - 1; i++) {
		if (A[i] < 0) {
			A[i] += BASE;
			A[i + 1]--;
		}
	}
	while (!A.empty()) {
		if (A.d.back() == 0) {
			A.d.pop_back();
		} else {
			break;
		}
	}
	return A;
}
positive_bigint operator-(const positive_bigint &A, const positive_bigint &B) {
	positive_bigint A2 = A;
	A2 -= B;
	return A2;
}
positive_bigint operator*(const positive_bigint &A, const positive_bigint &B) {
	if (A.empty() || B.empty()) { return 0; }
	int N = A.size();
	int M = B.size();
	std::vector<long long> a(N);
	for (int i = 0; i < N; i++) { a[i] = A[i]; }
	std::vector<long long> b(M);
	for (int i = 0; i < M; i++) { b[i] = B[i]; }
	std::vector<long long> C = atcoder::convolution_ll(a, b);
	for (int i = 0; i < N + M - 2; i++) {
		C[i + 1] += C[i] / BASE;
		C[i] %= BASE;
	}
	if (C[N + M - 2] >= BASE) {
		C.resize(N + M);
		C[N + M - 1] += C[N + M - 2] / BASE;
		C[N + M - 2] %= BASE;
	}
	positive_bigint ans;
	ans.d.resize(C.size());
	for (int i = 0; i < C.size(); i++) { ans[i] = C[i]; }
	return ans;
}
positive_bigint operator*=(positive_bigint &A, const positive_bigint &B) {
	A = A * B;
	return A;
}
struct bigint {
	bool neg = false;
	positive_bigint a;
	bigint() {}
	bigint(long long X) : neg(X < 0), a(abs(X)) {}
	bigint(const positive_bigint &X, bool neg = false) : neg(neg), a(X) {}
	bigint(const std::string &s) {
		if (!s.empty()) {
			if (s[0] == '-') {
				neg = true;
				a = positive_bigint(s.substr(1, s.size() - 1));
			} else {
				a = positive_bigint(s);
			}
		}
	}
	bool empty() const { return a.empty(); }
	int size() const { return a.size(); }
	int &operator[](int i) { return a[i]; }
};
std::string to_string(const bigint &A) {
	std::string ans;
	if (A.neg) { ans += '-'; }
	ans += to_string(A.a);
	return ans;
}
std::istream &operator>>(std::istream &is, bigint &A) {
	std::string S;
	is >> S;
	if (S != "0") { A = bigint(S); }
	return is;
}
std::ostream &operator<<(std::ostream &os, bigint A) {
	os << to_string(A);
	return os;
}
positive_bigint abs(const bigint &A) { return A.a; }
int cmp(const bigint &A, const bigint &B) {
	if (!A.neg) {
		if (!B.neg) {
			return cmp(A.a, B.a);
		} else {
			return 1;
		}
	} else {
		if (!B.neg) {
			return -1;
		} else {
			return cmp(B.a, A.a);
		}
	}
}
bool operator==(const bigint &A, const bigint &B) { return cmp(A, B) == 0; }
bool operator!=(const bigint &A, const bigint &B) { return cmp(A, B) != 0; }
bool operator<(const bigint &A, const bigint &B) { return cmp(A, B) < 0; }
bool operator>(const bigint &A, const bigint &B) { return cmp(A, B) > 0; }
bool operator<=(const bigint &A, const bigint &B) { return cmp(A, B) <= 0; }
bool operator>=(const bigint &A, const bigint &B) { return cmp(A, B) >= 0; }
bigint operator+(const bigint &A) { return A; }
bigint operator-(const bigint &A) {
	bigint A2 = A;
	if (!A2.empty()) { A2.neg = !A2.neg; }
	return A2;
}
bigint &operator+=(bigint &A, const bigint &B) {
	if (A.neg == B.neg) {
		A.a += B.a;
	} else {
		int c = cmp(A.a, B.a);
		if (c > 0) {
			A.a -= B.a;
		} else if (c < 0) {
			A.a = B.a - A.a;
			A.neg = !A.neg;
		} else {
			A = 0;
		}
	}
	return A;
}
bigint operator+(const bigint &A, const bigint &B) {
	bigint A2 = A;
	A2 += B;
	return A2;
}
bigint &operator-=(bigint &A, const bigint &B) {
	if (A.neg != B.neg) {
		A.a += B.a;
	} else {
		int c = cmp(A.a, B.a);
		if (c > 0) {
			A.a -= B.a;
		} else if (c < 0) {
			A.a = B.a - A.a;
			A.neg = !A.neg;
		} else {
			A = 0;
		}
	}
	return A;
}
bigint operator-(const bigint &A, const bigint &B) {
	bigint A2 = A;
	A2 -= B;
	return A2;
}
bigint operator*=(bigint &A, const bigint &B) {
	if (A.empty() || B.empty()) {
		A = 0;
	} else {
		if (B.neg) { A.neg = !A.neg; }
		A.a *= B.a;
	}
	return A;
}
bigint operator*(const bigint &A, const bigint &B) {
	bigint A2 = A;
	A2 *= B;
	return A2;
}

str s;

struct Node {
	char op = '.';
	Node *l = nullptr, *r = nullptr;
	str val;
	bigint eval() {
		if (op == '.') {
			assert(sz(val));
			return bigint(val);
		}
		assert(l && r);
		bigint x = l->eval();
		bigint y = r->eval();
		if (op == '*') return x * y;
		if (op == '-') return x - y;
		assert(op == '+');
		return x + y;
	}
};

Node *make_op(char c, Node *l, Node *r) { return new Node{c, l, r}; }

Node *combine(V<Node *> nodes, str ops) {
	assert(sz(ops) == sz(nodes) - 1);
	V<Node *> node_stk;
	str op_stk;
	F0R(i, sz(nodes)) {
		if (sz(op_stk) && op_stk.bk == '*') {
			assert(sz(node_stk));
			node_stk.bk = make_op(op_stk.bk, node_stk.bk, nodes[i]);
			op_stk.pop_back();
		} else {
			node_stk.pb(nodes[i]);
		}
		if (i < sz(ops)) { op_stk.pb(ops.at(i)); }
	}
	F0R(i, sz(op_stk)) {
		node_stk.ft = make_op(op_stk.at(i), node_stk.ft, node_stk.at(i + 1));
	}
	return node_stk.ft;
	// assert(sz(nodes));
	// dbg(sz(nodes), ops);
	// exit(0);
}

pair<int, Node *> dfs(int pos) {
	V<Node *> nodes;
	str ops;
	int parity = 0;
	while (true) {
		dbg(parity, pos);
		if (parity == 0) {
			if (s.at(pos) == '(') {
				++pos;
				auto [npos, node] = dfs(pos);
				pos = npos;
				assert(sz(nodes) == sz(ops));
				nodes.pb(node);
			} else if (s.at(pos) == '-' || isdigit(s.at(pos))) {
				int sgn = 1;
				while (s.at(pos) == '-') ++pos, sgn *= -1;
				str num;
				while (isdigit(s.at(pos))) num += s.at(pos++);
				if (sgn == -1) num = '-' + num;
				nodes.pb(new Node{'.', nullptr, nullptr, num});
			} else {
				assert(false);
			}
		} else {
			if (s.at(pos) == ')') {
				++pos;
				return {pos, combine(nodes, ops)};
			}
			assert(s.at(pos) == '*' || s.at(pos) == '+' || s.at(pos) == '-');
			ops += s.at(pos++);
		}
		parity ^= 1;
	}
}

int main() {
	// read read read
	setIO();
	def(int, N);
	re(s);
	s = s + ")";
	dbg(s);
	auto ret = dfs(0);
	assert(ret.f == sz(s));
	ps(ret.s->eval());

	// you should actually read the stuff at the bottom
}

/* stuff you should look for
 * int overflow, array bounds
 * special cases (n=1?)
 * do smth instead of nothing and stay organized
 * WRITE STUFF DOWN
 * DON'T GET STUCK ON ONE APPROACH
 */