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