#include <iostream>
#include <vector>

using namespace std;

string s;

long long num(int &index) {
    long long ret = 0;
    while (index < s.size() && isdigit(s[index])) {
        ret *= 10;
        ret += s[index] - '0';
        index++;
    }
    return ret;
}

long long calc(int &index) {
    long long ret = num(index);
    while (index < s.size()) {
        if (s[index] == '+') {
            index++;
            ret += num(index);
        } else if (s[index] == '-') {
            index++;
            ret -= num(index);
        }
    }
    return ret;
}

int main() {
    string a, b;
    cin >> a >> b;
    s = "0" + a + b;
    int usi = 0;
    cout << calc(usi) << endl;
    return 0;
}