using System;

public class Program

{

    public static void Main()

    {

        int x = 1;

        int y = 2;

        int z = y - x;

        Console.WriteLine("Z: {0}", z);

        x = 5;

        y = x + z;

        Console.WriteLine("\nX: {0}\nY: {1}\nZ: {2}", x, y, z);

    }

}