Why is it Saying Bummer? Sometimes it saw to slow.

using System;

namespace Treehouse.CodeChallenges
{
    class Program
    {
        static void Main()
        {
            Console.Write("Enter the number of times to print \"Yay!\": ");
            string x = Console.ReadLine();
            while (true)
            {                
                try
                {                
                    int y = int.Parse(x);
                    int z = 1;
                    if(z <= y)
                    {    
                        Console.WriteLine("Yay!");
                        z++;                        
                    }

                    else if(z <= 0)
                    {
                        Console.WriteLine("You must enter a positive number.");
                        continue;
                    }
                }
                catch(FormatException)
                {
                    Console.WriteLine("You must enter a whole number");
                    continue;
                }
            }
        }
    }
}