using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        Node n = new Node(0);

        SingleLinkedList list = new SingleLinkedList();

        list.Head =n;

        for (int i =1; i< 5; i++)

        {

            Node t = new Node(i);

            list.AddNode(t);

        }

    //  list.PrintNodes();

    }

    public class Node       

    {

        public int value ;

        public Node next ;

        public Node(int val)

        {

            value =val;

            next = null;

        }

    }

    public class SingleLinkedList

    {

        public Node Head ;

        public void AddNode(Node x)

        {

            while( Head.next != null)

            {

                Node z = Head.next;

                Head.next =z;

            }

                Head.next =x;

        }

        public void PrintNodes()

        {

            while( Head.next != null)

            {

                Console.WriteLine(Head.value);

            }

        }

    }

}