using System;

using System.Collections.Generic;

using System.Linq;

using System.Text.RegularExpressions;

​

namespace consoleApp1

{

    public class Program

    {

        public static void Main(string[] args)

        {

            int n;

            string buf;

            int product = 1;

            Console.WriteLine("Enter size for array count:");

            buf = Console.ReadLine();

            n = Convert.ToInt32(buf);

            int[] a = new int[n];

            for (int i = 0; i < n; i++)

            {

                Console.WriteLine("Enter element:");

                buf = Console.ReadLine();

                a[i] = Convert.ToInt32(buf);

            }

            for (int i = 0; i < n; i++)

            {

                if(a[i]%2 == 0){

                    product *= a[i];

                }

            }

            if(product == 1){

                Console.WriteLine("There is no any even element in the array.");

            } else {

                Console.WriteLine("The product of the even elements of array is: {0}", product);

            }

        }

    }

}