#include <iostream>

using std::cin;
using std::cout;
using std::endl;

int main(void) {
    int val1, val2, res;
    char oper;
    cin >> val1 >> oper >> val2;
    switch (oper) {
        case '+':
            res = val1 + val2;
            break;
        case '-':
            res = val1 - val2;
            break;
        default:
            return -1;
    }
    cout << res << endl;
    return 0;
}