using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

            HashSet<int> EmployeeIds = new HashSet<int>();

            // Add numbers to HashSet object 'EmployeeIds'

            EmployeeIds.Add(11);

            EmployeeIds.Add(12);

            EmployeeIds.Add(13);

            // Add again 11 to EmployeeIds

            EmployeeIds.Add(11);

            Console.WriteLine("Total count of the EmployeeIds= " + EmployeeIds.Count);

            foreach (int i in EmployeeIds)

            {

                Console.WriteLine(i);

            }

           Console.WriteLine();

            int[] myIntArray = new int[4] { 11, 12, 13, 11 };

            Console.WriteLine("Total length of the myIntArray= " + myIntArray.Length);

            foreach (int i in myIntArray)

            {

                Console.WriteLine(i);

            }

    }

}