cost = float(input())
months = int(input())
saved = 0

for j in range(1, months + 1):
        if j >=0 and j <= 2:
            colected = cost * 0.25
            saved += colected

        if j %  2 != 0 and j != 1:
            spent = saved * 0.16
            saved -= spent

        if j % 4 == 0 and j !=0:
            colected = saved * 0.25
            saved += colected
        if j >= 3:
            colected = cost * 0.25
            saved += colected

if saved >= cost:
    print(f'Bravo! You can go to Disneyland and you will have {(saved - cost):.2f}lv. for souvenirs.')
else:
    print(f'Sorry. You need {(cost-saved):.2f}lv. more.')