#include <bits/stdc++.h>
using namespace std;
int main(){
	int a;
	int b;
	char c;
	cin >>a>>b>>c;
	switch(c){
		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!";
						break;
						
	}	
	return 0;
}