01. Back To The Past

heritage = float(input())
to_year = int(input())
current_age = 17

for i in range(1800, to_year + 1):
    current_age += 1
    if i % 2 == 0:
        heritage -= 12000
    else:
        heritage -= 12000 + 50 * current_age

if heritage >= 0:
    print(f"Yes! He will live a carefree life and will have {heritage:.2f} dollars left.")
else:
    print(f"He will need {abs(heritage):.2f} dollars to survive.")