using System;

public class Program

{

    public class Node

    {

        public int Data;

        public Node left;

        public Node right;

    }

    public static void Main()

    {

        // next line creates instance of node (an object)

        Node head = new Node();

        head.Data = 5;

        head.next = new Node();

        head.next.Data = 7;

        head.next.next = new Node();

        Node newitem = new Node();

        newitem.Data = 3;

        newitem.next= head.next.next;

        head.next.next = newitem;

        newitem = new Node();

        new item.Data = 88;

        head.next.next.next.next.next = newitem;

        Console.WriteLine(head.next.Data);

    }

}