using System;
using System.Threading;
class Program
{
    static void Main(string[] args)
    {
        ManualResetEvent[] MREs = new ManualResetEvent[3]; 
        int i;
        for (i = 0;i < 3;i++)
        {
            MREs[i] = new ManualResetEvent(false);
        }
        for (i = 0;i < 15;i += 5)
        {
            ThreadPool.QueueUserWorkItem(state =>
            {
                int x = (int)state;
                for (int j = 1;j <= 75;j++)
                {
                    MREs[x / 5].WaitOne();
                    if ((((j - 1) % 15) - x < 5) && (((j - 1) % 15) - x >= 0))
                    Console.WriteLine(j);
                    if (j % 5 == 0)
                    {
                        MREs[x / 5].Reset();
                        MREs[(x / 5 + 1) % 3].Set();
                    }
                }
                MREs[x / 5].Set();
            }, i);
        }
        MREs[0].Set();
        WaitHandle.WaitAll(MREs);
        Console.ReadLine();
    }
}