#include <bits/stdc++.h>
#define rep(i,n) for(int i = 0; i < (n); i++)
using namespace std;
typedef long long ll;

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);

    auto f = [](string s) {
        int n = int(s.size());
        int sgn = +1, res = 0;
        for(int i = 0; i < n; i++) {
            if(isdigit(s[i])) {
                int pos = i, num = 0;
                while(pos < n && isdigit(s[pos])) {
                    num = num * 10 + (s[pos] - '0');
                    pos++;
                }
                res += sgn * num;
            } else {
                if(s[i] == '+') sgn = +1;
                if(s[i] == '-') sgn = -1;
            }
        }
        return res;
    };
    
    string s; cin >> s;
    string t = "";
    int n = int(s.size());
    for(int i = 0; i < n; i++) {
        if(s[i] == '(') {
            int j = i + 1;
            for(; j < n; j++) if(s[j] == ')') break;
            string u = "";
            for(int k = i + 1; k < j; k++) u += s[k];
            t += to_string(f(u));
            i = j;
        } else {
            t += s[i];
        }
    }

    cout << f(t) << "\n";
}