import java.util.Scanner;

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

        double budget = Double.parseDouble(scanner.nextLine());
        String productName = scanner.nextLine();
        int productCount = 0;
        boolean isFinished = false;
        boolean isBigger = false;
        double priceTotal = 0;
        double priceNeeded = 0;

        while (!"Stop".equals(productName)) {
            double productPrice = Double.parseDouble(scanner.nextLine());

            if (productPrice > budget) {
                priceNeeded = productPrice - budget;
                isBigger = true;
                break;
            }
            productCount++;

            if (productCount > 1 && productCount % 3 == 0) {
                productPrice *= 0.50;
            }
            budget -= productPrice;

            if (budget <= 0) {
                isFinished = true;
                break;
            }
            priceTotal += productPrice;
            productName = scanner.nextLine();
        }
        if (isBigger) {
            System.out.println("You don't have enough money!");
            System.out.printf("You need %.2f leva!", priceNeeded);
        } else {
            if (isFinished){
                System.out.printf("You bought %d products for %.2f leva.", productCount, priceTotal);
            }
            else {
                System.out.printf("You bought %d products for %.2f leva.", productCount, priceTotal);
            }

        }
    }
}