gistfile1.txt

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace ConsoleApp1
{
    class SlowMethod
    {
        public Int64 Run()
        {
            Thread.Sleep(100);
            return 1000000;
        }
    }

    class Program
    {
        static void Main(string[] args)
        {
            Int64 sum = 0;
            Random rnd = new Random();
            for (int i = 0; i < 50000; ++i)
            {
                SlowMethod m = (rnd.Next(0, 1000) == 0) ? new SlowMethod() : null;
                /*
                if (m == null)
                {
                    sum += 1;
                } else
                {
                    sum += m.Run();
                }
                */
                // sum += (m == null) ? 1 : m.Run();
                sum += m?.Run() ?? 1;
            }
            Console.WriteLine(sum);
        }
    }
}