using System;

namespace _04.TouristShopM2
{
    class Program
    {
        static void Main(string[] args)
        {
            double oneProductPrice = 0.0;
            double sumProductPrice = 0.0;
            int countProducts = 0;

            double budget = double.Parse(Console.ReadLine());
            string productName = Console.ReadLine();

            while (productName != "Stop")
            {
                oneProductPrice = double.Parse(Console.ReadLine());
                countProducts++;
                if (countProducts % 3 == 0) oneProductPrice = oneProductPrice / 2.0;
                if (oneProductPrice > budget)
                {
                    Console.WriteLine("You don't have enough money!");
                    Console.WriteLine($"You need {oneProductPrice - budget:F2} leva!");
                    return;
                }
                sumProductPrice += oneProductPrice;
                budget -= oneProductPrice;
                productName = Console.ReadLine();
            }
            Console.WriteLine($"You bought {countProducts} products for {sumProductPrice:F2} leva.");
        }
    }
}