Clever Lily

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

toys_count = 0
money_sum = 0
total_sum = 0

for years in range(1, age_Lilly + 1):

    if years % 2 == 1:
        toys_count += 1
    else:
        money_sum += years * 5 - 1

total_sum = toys_count * price_toy + money_sum
differance = abs(total_sum - price_washing_machine)
if total_sum >= price_washing_machine:

    print(f"Yes! {differance:.2f}")
else:
    print(f"No! {differance:.2f}")