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