using System;

using System.Linq;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public async static Task Main()

    {

        Sleep(TimeSpan.FromSeconds(1));

        Sleep(TimeSpan.FromSeconds(1));

        Sleep(TimeSpan.FromSeconds(1));

        Console.WriteLine("Hello from Main");

    }

    public static async Task Sleep(TimeSpan sleepTime)

    {

        await Task.Factory.StartNew(() => Thread.Sleep((int)sleepTime.TotalMilliseconds));

        Console.WriteLine("Hello from Sleep");

    }

}