using System;

abstract class A{

public abstract int B();

public void C(){}

}

​

 class Dog : A

{

public int x = 6 ;

​

public override int B(){

return x*x;

}

}

​

class E{

static void Main(){

​

Dog d = new Dog();

double res =d.B();

Console.WriteLine(res);

​

}

}