Clever Lily

n = int(input())
price_washing_machine = float(input())
price_toy = float(input())

toy_count = 0
money_count = 0
money_brother = 0

for i in range(1, n+1):
    if i % 2 == 0:
        money_count += (i/2)*10
        money_count -= 1
    else:
        toy_count += 1

money_from_toys = toy_count * price_toy
money_count += money_from_toys


if money_count >= price_washing_machine:
    print(f"Yes! {abs(money_count-price_washing_machine):.2f}")
else:
    print(f"No! {abs(money_count-price_washing_machine):.2f}")