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

int main () {
	 ios::sync_with_stdio(false);
	 cin.tie(nullptr);
	 cout.tie(nullptr);
	 int x, y;
	 char type;
	 cin >> x >> y >> type;
	 switch(type) {
		case '+':
			cout << x + y << '\n';
			break;
		case '-':
			cout << x - y << '\n';
			break;
		case '*':
			cout << x * y << '\n';
			break;
		case '/':
			if (y == 0) {
				cout << "cannot divide by zero\n";
			} else {
				cout << x / y << '\n';
			}
			break;
		case '%':
			cout << x % y << '\n';
			break;
	 }
}