import java.util.Scanner;

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

        double journeyCost = Double.parseDouble(scanner.nextLine());
        int numbersOfMonths = Integer.parseInt(scanner.nextLine());

        double totalMoney = 0;

        for (int i = 1; i <= numbersOfMonths; i++) {
            if (i % 2 == 1 && i != 1) {
                double spentMoney = totalMoney * 0.16;
                totalMoney -= spentMoney;
            }
            if (i % 4 == 0) {
                double bonus = totalMoney * 0.25;
                totalMoney += bonus;
            }
            double saveTheMoney = journeyCost * 0.25;
            totalMoney += saveTheMoney;
        }
        if (totalMoney >= journeyCost) {
            double moneySouvenirs = totalMoney - journeyCost;
            System.out.printf("Bravo! You can go to Disneyland and you will have %.2flv. for souvenirs.", moneySouvenirs);
        } else {
            double lostMoney = journeyCost - totalMoney;
            System.out.printf("Sorry. You need %.2flv. more.", lostMoney);
        }

    }
}