Can't figure out why my code won't pass test for task 2--no error information given.

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
            Console.Write("Enter the number of times to print \"Yay!\": ");

            int howmanytimes = 0;

            int numberoftimes = 0;

            bool goodinput = false;

            while(goodinput == false)
            {


                try 
                {
                    howmanytimes = int.Parse(Console.ReadLine());

                 }


                catch (FormatException formex)
                {
                    Console.WriteLine("You must enter a whole number.");
                    continue;

                }

                 catch (ArgumentException argex)
                {
                    Console.WriteLine("You must enter a whole number.");
                    continue;

                }

                 catch (OverflowException ofex)
                {
                    Console.WriteLine("You must enter a whole number.");
                    continue;

                }

                 if (howmanytimes >= 0)
                    {
                        goodinput = true;
                    }
                    else
                    {
                        Console.WriteLine("You must enter a whole number.");
                    }

            }


            while (numberoftimes < howmanytimes)
            {


             Console.WriteLine("Yay!");
             numberoftimes += 1;
            }

        }
    }
}