Calculate Factorial Method (Exercise)

using System;
using System.Globalization;
using System.Numerics;
using System.Threading;

namespace ConsoleTests
{
    class ConsoleTests
    {
        static void Main()
        {
            Console.Write("Enter integer between 1 and 100: ");
            CalcFact(int.Parse(Console.ReadLine()));
            Console.ReadKey();
        }

        private static void CalcFact(int input)
        {
            BigInteger fact = input;
            for (int i = input - 1; i >= 2; i--)
            {
                fact = fact * i;
                Thread.Sleep(200);
                Console.WriteLine("{0}", fact);
                Thread.Sleep(0);
            }
            Console.WriteLine("\nFactorial of {0} is: {1} ", input, fact);
        }

    }
}