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

int main() {
    string a, b, formula;
    cin >> a >> b;
    formula = '+' + a + b + '+';
    int ans = 0, cache = 0, sign = 1;
    for (char c : formula) {
        if (c == '+') {
            ans += sign * cache;
            cache = 0;
            sign = 1;
        } else if (c == '-') {
            ans += sign * cache;
            cache = 0;
            sign = -1;
        } else {
            cache = 10 * cache + c - '0';
        }
    }
    cout << ans << endl;
}