1233

import math
monney_need = float(input())
months = int(input())
end_months_monney = 0
# current_monney = 0
total_money = 0
for every_month in range(1,months+1):
    # end_months_monney += monney_need * 0.25
    if every_month == 1:
        end_months_monney += monney_need * 0.25
        continue
    if every_month % 3 == 0:
        # end_months_monney += monney_need * 0.25
        end_months_monney -= end_months_monney * 0.16
    if every_month % 4 == 0:
        # end_months_monney += monney_need * 0.25
        end_months_monney += end_months_monney * 0.25
    end_months_monney += monney_need * 0.25
total_money = end_months_monney - monney_need

if total_money >= monney_need:
    print(f"Bravo! You can go to Disneyland and you will have {total_money}lv. for souvenirs.")
else:
    total_money = total_money * -1
    print(f"Sorry. You need {total_money:.02f}lv. more.")