#include <bits/stdc++.h>
#define int long long
using namespace std;

signed main(){
    string s;
    cin >> s;
    int ans = 0;
    s = "+" + s;
    for(int i = 0; i < s.size();){
        int tmp = 0;
        char op = s[i];
        if(s[i + 1] == '('){
            tmp = s[i + 2] - '0';
            for(int j = i + 3; j < s.size(); j += 2){
                if(s[j] == ')'){
                    i = j + 1;
                    break;
                }
                if(s[j] == '+') tmp += s[j + 1] - '0';
                else if(s[j] == '-') tmp -= s[j + 1] - '0';
            }
        }else{
            tmp = s[i + 1] - '0';
            i += 2;
        }
        if(op == '+') ans += tmp;
        else if(op == '-') ans -= tmp;
    }
    cout << ans << endl;
}