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