using System;

using System.Collections;

using System.Linq;

​

public class Program

    {

        public static void Main(string[] args)

        {

            int[] array1 = { 1, 3, 4, 2, 4 };

            bool isExisted = array1.Count(item => item == 4) >= 2;

            Console.WriteLine(isExisted);

        }

}