#include <iostream>
using namespace std;
  
int main()
{ 
    int a,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;
}