import java.util.Scanner;

public class P04_TouristShop {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);

        double budget = Double.parseDouble(scan.nextLine());
        String product = scan.nextLine();
        int counter = 0;
        double moneySpend = 0.0;
        while (!"Stop".equals(product)) {
            double price = Double.parseDouble(scan.nextLine());
            counter++;
            if (counter % 3 == 0) {
                price /= 2.0;
            }
            if (price > budget) {
                System.out.println(String.format("You don't have enough money!%nYou need %.2f leva!", price - budget));
                break;
            }
            budget -= price;
            moneySpend += price;
            product = scan.nextLine();
        }

        if ("Stop".equals(product)) {
            System.out.println(String.format("You bought %d products for %.2f leva.", counter, moneySpend));
        }
    }
}