#include <iostream>

using namespace std;

int main()
{
    char id;
    int age;

    cout << "Welcome to the club.";

    cout << "Do you have id? (Y/N)";
    cin >> id;

    // The person has id.
    if(id=='y' || id=='Y') {
        cout << "How old are you? ";
        cin >> age;
        // They have id and are 21 or over.
        if(age>=21)
            cout << "You may enter!" << endl;
        // They have id, but are under 21.
        else if (age<21)
            cout << "Sorry, you must leave.";
    }
    // They don't have id.
    else
        cout << "Sorry, you must leave.";
}