#include <bits/stdc++.h>

using namespace std;

int main() {
    ios::sync_with_stdio(false);
    cin.tie(0);
    cout.tie(0);
    string s;
    cin >> s;
    int sum = 0;
    bool a = false;
    int num = 0;
    for (int i = 0;i <= s.size();i++) {
        if( i == s.size())
        {
            if (a) {
                sum -= num;
            }
            else {
                sum += num;
            }
        }
            
        if (s[i] == '-' || s[i] == '+') {
            if (a) {
                sum -= num;
            }
            else {
                sum += num;
            }
            num = 0;
            if (s[i] == '-') {
               a = true;
            }
            
            
        }
        else {
            num = num*10 +s[i] - '0';
        }
    }
    cout << sum;
    return 0;
}