using System;

using System.Collections.Generic;

​

namespace Contains

{

    public class Program

    {

        public static void Main(string[] args)

        {

            var numbers = new List<int> {5, 10, 15, 20, 25, 30};

            bool result = numbers.Contains(25);

​

            Console.WriteLine(result);

            Console.ReadLine();

        }

    }

}