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