fruit = input()
day = input()
quantity = float(input())
price = 0

is_weekend = day == 'Saturday' or day == 'Sunday'
is_weekday = day == 'Monday' or 'Tuesday' or 'Wednesday' or 'Thursday' or 'Friday'

if is_weekend:
    if fruit == 'banana':
        price = 2.70
    elif fruit == 'apple':
        price = 1.25
    elif fruit == 'orange':
        price = 0.90
    elif fruit == 'grapefruit':
        price = 1.60
    elif fruit == 'kiwi':
        price = 3.00
    elif fruit == 'pineapple':
        price = 5.60
    elif fruit == 'grapes':
        price = 4.20
elif is_weekday:
    if fruit == 'banana':
        price = 2.50
    elif fruit == 'apple':
        price = 1.20
    elif fruit == 'orange':
        price = 0.85
    elif fruit == 'grapefruit':
        price = 1.45
    elif fruit == 'kiwi':
        price = 2.70
    elif fruit == 'pineapple':
        price = 5.50
    elif fruit == 'grapes':
        price = 3.85

total_price = price * quantity

if total_price > 0:
    print(f'{total_price:.2f}')
else:
    print('error')