using System;

using System.Linq;                  

​

namespace exercises

{

    public class Program

     {

        public static void Main(string[] args)

         {

             Console.WriteLine(test(new[] {1,1,2,3,1}));

             Console.WriteLine(test(new[] {1,1,2,4,1}));

             Console.WriteLine(test(new[] {1,1,2,1,2,3}));

             Console.ReadLine();

          }

        public static bool test(int[] nums)

        {

            for (var i = 0; i < nums.Length-1; i++)

            {

                if (nums[i] == 1 && nums[i + 1] == 2 && nums[i + 2] == 3)

                    return true;

            }

            return false;

        }

    }   

}