#include <iostream>
using namespace std;
int main()
{
    int a, b;
    char op;
    cin >> a >> b >> op;
    if(op == '+'){
        cout << a + b << endl;
    }
    else if(op == '-'){
        cout << a - b << endl;
    }
    else if(op == '*'){
        cout << a * b << endl;
    }
    else if(op == '/'){
        if(b == 0){
            cout << "Divided by zero!" << endl;
        }
        else{
            cout << a / b << endl;
        }
    }
    else{
        cout << "Invalid operator!" << endl;
    }
    return 0;
}