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