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