ski_trip_09_02

days = int(input())
accommodation = input()
score = input()

price = 0

if accommodation == "room for one person":
    price = 18

elif accommodation == "apartment":
    price = 25
    if days >= 15:
        price *= 0.5
    elif days >= 10:
        price *= 0.65
    else:
        price *= 0.7

else:
    price = 35
    if days >= 15:
        price *= 0.8
    elif days >= 10:
        price *= 0.85
    else:
        price *= 0.9

if score == "positive":
    price *= 1.25
else:
    price *= 0.9

print(f"{(days - 1) * price:.2f}")