#include<iostream>
using namespace std;
int main() {
	int n,x;
	char czf;
	cin>>n>>x>>czf;
	if(czf!='+' || czf!='-' ||czf!='*' || czf!='/') cout<<"Invalid operator!";
	if(x==0) cout<<"Divided by zero!";
	switch (czf) {
		case '+':
			cout<<n+x;
			break;
		case '-':
			cout<<n-x;
			break;
		case '*':
			cout<<n*x;
			break;
		case '/':
			cout<<n/x;
			break;	
	}
	return 0;
}