using System;

using System.Threading;

using System.Threading.Tasks;

public class Program

{

    public static async Task<int> Sleep() 

    {

        await Task.Delay(2000);

        return 1;

    }

    public static async void Demo1()

    {

        Console.WriteLine("Taking a break...");

        await Sleep();

        Console.WriteLine("After 2 seconds...");

    }

    public static void Demo2()

    {

        Console.WriteLine("Demo2: Before");

        Demo1();

        Console.WriteLine("Demo2: After");

    }

    public static void Demo3()

    {

        Console.WriteLine("Demo3: Before");

        Demo2();

        Console.WriteLine("Demo3: After");

    }

    public static void Main()

    {

        Demo3();

    }

}