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

string s;
int i = 0;
int f();

int g() {
    if(isdigit(s[i])) {
        int res = s[i] - '0';
        i++;
        return res;
    }
    if(s[i] == '(') {
        i++;
        int res = f();
        i++;
        return res;
    }
}

int f() {
    int res = g();
    while(true) {
        if(s[i] == '+') {
            i++;
            res += g();
        } else if(s[i] == '-') {
            i++;
            res -= g();
        } else {
            return res;
        }
    }
}

int main(){
    cin.tie(0);
    ios::sync_with_stdio(0);
    
    cin >> s;
    cout << f() << endl;
}