using System;

public class Program

{

    public static void Main()

    {

        var a = new My(1);

        var b = new My(2);

        var c = new My(3);

        a=b;

        b=c;

        c=a;

        a.set(4);

        b.set(5);

        c.set(6);

        Console.WriteLine(a);

        Console.WriteLine(b);

        Console.WriteLine(c);

    }

    public class My{

        private int x;

        public My(int y){

            x=y;

        }

        public int get(){

        return x;

        }

        public void set(int a){

        x=a;}

    }

}