using System;

using System.Collections.Generic;

using System.Linq;

using System.Threading.Tasks;

​

public class Program

{

    public static async Task<int> GetData()

    {

        await Task.Delay(10);

        return 1;

    }

    public static async void Main()

    {

        var data =  await GetData();

        Console.WriteLine("Hello World "+ data);

    }

}