using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        var myList = new List<int>{1,2,3,7,8,9,1,2,5,9,1,8,3,1,9,6,1};

        // filter numbers <= 5

        var filtered = myList.Where(x => x <= 5);

        Console.WriteLine(String.Join("\t", myList));

        Console.WriteLine(String.Join("\t", filtered));

    }

}