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