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Program.cs

using System;
using System.Threading.Tasks;

class Program
{
    static async ValueTask<int> HeavyTask(int value)
    {
        await Task.Delay(1000);
        return value * value;
    }

    static async Task MainAsync(string[] args)
    {
        Console.WriteLine("Start task");
        var result = await HeavyTask(100);
        Console.WriteLine($"result: {result}");
    }

    static void Main(string[] args) => MainAsync(args).Wait();
}