using System;
using System.Text;
namespace ConsoleApplication1
{
    class Program
    {
        // Helpful url: [url]http://en.wikipedia.org/wiki/Hailstone_numbers[/url]
        static void Main(string[] args)
        {
            int first;
            System.Console.WriteLine("Enter the integer you would like to run the function on: ");
            first = int.Parse(System.Console.ReadLine());
            while (first != 1)
            {
                System.Console.Write(first + " ");
                first = f(first);
            }
            System.Console.WriteLine(first);
            System.Console.WriteLine("Press enter to continue.");
            ConsoleKeyInfo c = System.Console.ReadKey();
            while (c.Key != ConsoleKey.Enter)
            {
                c = System.Console.ReadKey();
            }
        }
        private static int f(int first)
        {
            if (first % 2 == 0)//test to see if even
            {
                return first /= 2;
            }
            else
            {
                return first = 3 * first + 1;//is odd
            }
        }
    }
}