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