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