ski trip

days = int(input())
type = input()
opinion = input()
price = 0
price1 = 0
if type == 'room for one person':
    if opinion == 'positive':
        price = (days - 1) * 18 * 1.25
    elif opinion == 'negative':
        price = (days - 1) * 18 * 0.9
elif type == 'apartment':
    if opinion == 'positive':
        if days <= 10:
            price1 = 25 * 0.7
        elif 10 < days <= 15:
            price1 = 25 * 0.65
        elif days > 15:
            price1 = 25 * 0.5
        price = (days - 1) * price1 * 1.25
    elif opinion == 'negative':
        if days <= 10:
            price1 = 25 * 0.7
        elif 10 < days <= 15:
            price1 = 25 * 0.65
        elif days > 15:
            price1 = 25 * 0.5
        price = (days - 1) * price1 * 0.9
elif type == 'president apartment':
    if opinion == 'positive':
        if days <= 10:
            price1 = 35 * 0.9
        elif 10 < days <= 15:
            price1 = 35 * 0.85
        elif days > 15:
            price1 = 35 * 0.8
            price = (days - 1) * price1 * 1.25
    elif opinion == 'negative':
        if days <= 10:
            price1 = 35 * 0.9
        elif 10 < days <= 15:
            price1 = 35 * 0.85
        elif days > 15:
            price1 = 35 * 0.8
        price = (days - 1) * price1 * 0.9
print(f'{price:.2f}')