using System;

namespace _04.TouristShop
{
    class TouristShop
    {
        static void Main(string[] args)
        {
            double budget = double.Parse(Console.ReadLine());
            string nameProduct = Console.ReadLine();

            int countEquipment = 1;
            double sumCost = 0;

            while (nameProduct != "Stop")
            {
                double price = double.Parse(Console.ReadLine());

                if (countEquipment % 3 == 0)
                {
                    price /= 2;
                }

                if (price > budget)
                {
                    double needed = price - budget;
                    Console.WriteLine($"You don't have enough money!");
                    Console.WriteLine($"You need {needed:f2} leva!");
                    break;
                }

                countEquipment++;
                budget -= price;
                sumCost += price;

                nameProduct = Console.ReadLine();
            }

            if (nameProduct == "Stop")
            {
                double fix = countEquipment - 1;
                Console.WriteLine($"You bought {fix} products for {sumCost:f2} leva.");
            }
        }
    }
}