class Program
    {
            public static List<string> guestNames = new List<string>();
            public static int guestCounter = 0;
            public static bool isRunning = true;

        static void Main(string[] args)
        {
            while (isRunning)
            {
                GetGuestName();
                GetGuestCount();

                if (GetGuestName() == false || GetGuestCount() == false)
                {
                    isRunning = false;
                }
            }

            GetPartyInfo();
        }

       private static bool GetGuestName()
        {
            Console.Write("Please enter your name or type exit: ");
            string userInput = Console.ReadLine();

            bool isInvalidInput = int.TryParse(userInput, out int numCheck);

             if (isInvalidInput == false)
            {
                if (userInput.ToLower() != "exit")
                {
                    guestNames.Add(userInput);
                    guestCounter += 1;
                }

                else if (userInput.ToLower() == "exit")
                {
                    return false;
                }
            }

            else if (isInvalidInput == true) ;
            {
                Console.WriteLine("Please enter a valid name: ");
                GetGuestName();
            }

            return true;
        }

        private static bool GetGuestCount()
        {
            Console.Write("Please enter the number of guests in your party or exit: ");
            string userInput = Console.ReadLine();

            bool isValidInput = int.TryParse(userInput, out int partyCount);

            if (isValidInput == true)
            {
                guestCounter += partyCount;
            }

            else if (isValidInput == false)
            {
                if (userInput.ToLower() == "exit")
                {
                    return false;
                }
                else
                {
                    Console.WriteLine("Please enter a valid number...");
                }
            }

         return true;
        }
        private static void GetPartyInfo()
        {
            for (int i = 0; i < guestNames.Count; i++)
            {
                Console.WriteLine(guestNames[i]);
            }

            Console.WriteLine($"There are { guestCounter } guests at the party.");
        }
    }