using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApplication60
{
    class Program
    {
        static void Main(string[] args)
        {
            Folder current = new Folder();
            current.ToChild();
            Console.WriteLine(current.CurrentFolder);

        }
    }

    class Folder
    {
        public Folder ParentFolder
        {
            get;
            set;
        }

        public Folder ChildFolder
        {
            get;
            set;
        }

        public Folder CurrentFolder
        {
            get;
            set;
        }

        public void ToChild()
        {
            CurrentFolder = ChildFolder;
        }

        public void ToParent()
        {
            CurrentFolder = ParentFolder;
        }


    }
}