#include<bits/stdc++.h>

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<<ab;break; case '/':if(b!=0) cout<<a/b;else cout<<"Divided by zero!";break; default:cout<<"Invalid operator!"; } return 0; }