using System;

public class A {
  protected int number;

	public A(int x)
	{ number = 5*x; }

	public A()
	{ number = 0; }

	public int getNumber()
	{ return number; }

	public void setNumber(int x)
	{ number = 3*x; }

	public static void Main(string[] args) 
	{
		A a = new A(6);
		B b = new B(3);

		Console.WriteLine("A: "+a.getNumber()+"\n");
		Console.WriteLine("B: "+b.getNumber()+"\n");

		a.setNumber(8);
		b.setNumber(3);

		Console.WriteLine("A: "+a.getNumber()+"\n");
		Console.WriteLine("B: "+b.getNumber()+"\n");

	}
}