using System;

namespace LambdaFac
{
    using T = Func<Func<dynamic, Func<int, int>>, Func<int, int>>;
    static class Program
    {
        static void Main()
        {
            var fac = ((T) (self_fix => self_fix(self_fix)))(f => x => x <= 1 ? 1 : x * f(f)(x - 1));
            for (var i = 0; i < 10; i++)
            {
                Console.WriteLine($"the factorial of {i} is {fac(i)}");
            }

            Console.ReadLine();
        }
    }
}