using System;

using System.Threading;

​

namespace ConsoleApplication1

{

    class TheClub

    {

        static SemaphoreSlim _sem = new SemaphoreSlim(6);

​

        static void Main()

        {

            for (int i = 0; i <= 5; i++) new Thread(Enter).Start(i);

            Console.ReadKey();

        }

​

​

        static void Enter(object id)

        {

            Console.WriteLine(id + " wants to enter");

            _sem.Wait();

            Console.WriteLine(id + " is in!");

            Thread.Sleep(3000 * (int)id);

            Console.WriteLine(id + " is leaving");

            _sem.Release();

        }

    }

}