#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
#define rep(i, n) for(ll i = 0, i##_len = (n); i < i##_len; i++)
#define reps(i, s, n) for(ll i = (s), i##_len = (n); i < i##_len; i++)
#define rrep(i, n) for(ll i = (n) - 1; i >= 0; i--)
#define rreps(i, e, n) for(ll i = (n) - 1; i >= (e); i--)
#define all(x) (x).begin(), (x).end()
#define sz(x) ((ll)(x).size())
#define len(x) ((ll)(x).length())

ll f(string s) {
    ll tmp = 0, ans = 0;
    bool plus = false, minus = false;
    s += "=";
    rep(i, len(s)) {
        if ((s[i] >= '0') && (s[i] <= '9')) {
            tmp = tmp * 10 + (s[i] - '0');
            continue;
        }
        if ((!plus) && (!minus)) ans = tmp;
        else if (plus) ans += tmp;
        else ans -= tmp;
        plus = false; minus = false;
        if (s[i] == '+') plus = true;
        else if (s[i] == '-') minus = true;
        tmp = 0;
    }
    return ans;
}

int main() {
    cin.tie(0);
    ios::sync_with_stdio(false);
    // ifstream in("input.txt");
    // cin.rdbuf(in.rdbuf());
    string s;
    cin >> s;
    string ns = "", tmp = "";
    bool in = false;
    rep(i, len(s)) {
        if (s[i] == '(') {
            in = true;
            tmp = "";
        }
        else if (s[i] == ')') {
            ll v = f(tmp);
            ns += to_string(v);
            in = false;
        }
        else {
            if (in) tmp += s[i];
            else ns += s[i];
        }
    }
    cout << f(ns) << endl;
    return 0;
}