public class SocialWorker
{
    public static void main(String[] args)
    {
        Parent p = new Parent();
        System.out.println(p.f(7));
        //Illegal:  the f(int,int) belongs to child.
        System.out.println(p.f(3,2));
        System.out.println(p.g(2));
       

    }
}