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

int main() {
	char s = '+'or'-'or'*'or'/';
	int a, b, c;
	cin >> a >> b >> s;
	if (s == '+'){
		c = a + b;
	    cout << c;
	} else if (s == '-'){
		c = a - b;
	    cout << c;
	} else if (s == '*'){
		c = a * b;
	    cout << c;
	} else if (s == '/'){
		if (b == 0){
			cout << "Divided by zero!"
		} else {
		    c = a / b;
	        cout << c;
	    }
    } else {
    	cout << "Invalid operator!"
	}
	return 0;
}