Assist on use of if/else in input validation.

using System;

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

            int count = int.Parse(input);
             if(input < 1)

             { 
                 Console.WriteLine("You must enter a positive number");
             }

        else
        {
            int i = 0;
            while(i < count)
            {
                i += 1;   
                Console.WriteLine("Yay!");
            }
            }
             catch (FormatException) 
             { 
                 Console.WriteLine("You must enter a whole number");
             }

        }
    }
}