using System;

using System.Linq;

using IdGen;

using System.Threading.Tasks;

using System.Collections.Concurrent;

public class Program

{

    public static void Main()

    {

        var collection = new ConcurrentBag<long>();

        var idGenerator = new IdGenerator(1);

        Parallel.For(0, 1000, _=> collection.Add(idGenerator.CreateId()));

        Console.WriteLine(collection.Distinct().Count());

    }

}