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