using System;

using System.Collections.Generic;

using System.Linq;

​

public class Program

{

    public static void Main()

    {

        var firstList = new List<int>();

        firstList.Add(2);

        firstList.Add(4);

        Console.WriteLine("LIST 1: " + firstList.Count);

        var secondList = firstList.Where(c => c == 2).ToList();

        Console.WriteLine("LIST 2: " + secondList.Count);

        firstList.Clear();

        Console.WriteLine("LIST 2: " + secondList.Count);

    }

}