08. Clever Lily

# 08. Clever Lily

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

count_toys = 0
amount = 10
money = 0
for year in range(1, age+1):
    if not year % 2 ==0:
        count_toys += 1
    else:
        money += amount - 1
        amount += 10
money += count_toys * toy_price
diff = abs(money - washing_mashine_price)
if money >= washing_mashine_price:
    print(f"Yes! {diff:.2f}")
else:
    print(f"No! {diff:.2f}")