#include<bits/stdc++.h> using namespace std; int main() { int x,y; char a; cin>>x>>y>>a; bool error_1=(a=='/'&&y==0),error_2=(a!='+'&&a!='-'&&a!='*'&&a!='/'); if(error_1) cout<<"Divided by zero!"; if(error_2) cout<<"Invalid operator!"; else { if(a=='+') { cout<<x+y; } if(a=='-') { cout<<x-y; } if(a=='*') { cout<<x*y; } if(a=='/') { cout<<x/y; } } return 0; }