using System;

using System.Linq;

using System.Collections.Generic;

​

public class Program

{

    public static void Main()

    {

        var arr = new List<int>{1, 2, 3, 4, 5};

        Console.WriteLine(arr.All(num => num == 4));

        Console.WriteLine(arr.Any(num => num == 4));

        if (arr.Any(num => num == 4))

            arr.Remove(4);

        arr.ForEach(x => Console.WriteLine(x));

    }

}