using System;

using System.Threading.Tasks;

public class Program

{

    static void Prepare(){

        System.Threading.Thread.Sleep(1000);

        Console.WriteLine("Prep done");

    }

    static void Calc(){

        System.Threading.Thread.Sleep(1000);

        Console.WriteLine("Calc done");

    }

    static async Task RequestAsync(){

        Console.WriteLine("Async stared");

        await System.Threading.Tasks.Task.Delay(2000);

        Console.WriteLine("Async completed");

    }

    public async static Task Main()

    {

        Console.WriteLine("Started");

        var requestTask = RequestAsync();

        Prepare();

        await requestTask;

        Calc();

        Console.WriteLine("Finished");

    }

}