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