using System;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        var t = new Task(() => {

            Console.WriteLine("Task1");

            System.Threading.Thread.Sleep(5000);

            Console.WriteLine("Task2");         

        });

        t.ContinueWith((_) => {

            Console.WriteLine("Task3");

        }).ContinueWith((_) => {

            Console.WriteLine("Task4");

        });

        t.Start();

        t.Wait();

        Console.WriteLine("Done");

    }

}