#include<iostream> using namespace std; int main() { int a,b; char c; cin>>a>>b>>c; if(c=='+') { cout<<a+b; } else if(c=='-') { cout<<a-b; } else if(c=='') { cout<<ab; } else if(c=='/') { if(b==0) { cout<<"Divide by zero"; } else { cout<<a/b; } } else { cout<<"Invalid operator"; } return 0; }