ski trip

days = int(input())
room = input()
scale = input()

bonus = 0
if room == "room for one person":
    total_nights = (days - 1) * 18
    bonus = 0
    if scale == "positive":
        bonus_2 = (0.25 * total_nights) + total_nights
    elif scale == "negative":
        bonus_2 = total_nights - (0.10 * total_nights)
    print(f"{bonus_2:.2f}")
elif room == "apartment":
    total_nights = (days - 1) * 25
    if days < 10:
        bonus = 0.30
    elif 10 <= days <= 15:
        bonus = 0.35
    elif days > 15:
        bonus = 0.5
    bonus_4 = total_nights - (bonus * total_nights)
    if scale == "positive":
        extra = bonus_4 * 0.25
        whole_price = bonus_4 + extra
    elif scale == "negative":
        extra = bonus_4 * 0.10
        whole_price = bonus_4 - extra
    print(f"{whole_price:.2f}")

if room == "president apartment":
    total_nights = (days - 1) * 35
    if days < 10:
        bonus = 0.1
    elif 10 <= days <= 15:
        bonus = 0.15
    elif days > 15:
        bonus = 0.2
    bonus_5 = total_nights - (bonus * total_nights)
    if scale == "positive":
        extra = bonus_5 * 0.25
        whole_price = bonus_5 + extra
    elif scale == "negative":
        extra = bonus_5 * 0.10
        whole_price = bonus_5 - extra
    print(f"{whole_price:.2f}")