clever lily

age = int(input())
washing_machine_price = float(input())
toy_price = int(input())

saved_money = 0
money_per_birthday = 0

for year in range(1, age + 1):
    if year % 2 != 0:
        saved_money += toy_price
    elif year % 2 == 0 and year == 2:
        money_per_birthday = 10
        saved_money += money_per_birthday
    elif year % 2 == 0 and year != 2:
        money_per_birthday += 10
        saved_money += money_per_birthday

# Money for brother
saved_money -= (age // 2)

diff = abs(saved_money - washing_machine_price)

if saved_money >= washing_machine_price:
    print(f'Yes! {diff:.2f}')
else:
    print(f'No! {diff:.2f}')