Tourist Shop

using System;

namespace TouristShop
{
    class Program
    {
        static void Main(string[] args)
        {
            double budget = double.Parse(Console.ReadLine());
            string product = Console.ReadLine();
            double sum = 0;
            double counter = 0;

            while (product != "Stop")
            {
                double price = double.Parse(Console.ReadLine());
                counter++;

                if (counter % 3 == 0)
                {
                    price /= 2;
                }
                sum += price;

                if (budget < sum)
                {
                    break;
                }

                product = Console.ReadLine();
            }

            if (product == "Stop")
            {
                Console.WriteLine($"You bought {counter} products for {sum:F2} leva.");
            }
            else
            {
                Console.WriteLine("You don't have enough money!");
                Console.WriteLine($"You need {sum - budget:F2} leva!");
            }
        }
    }
}