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