product = input()
day = input()
quantity = float(input())

price = 0

if day == 'Monday' \
        or day == 'Tuesday' \
        or day == 'Wednesday' \
        or day == 'Thursday' \
        or day == 'Friday':
    if product == 'banana':
        price = 2.5
    elif product == 'apple':
        price = 1.2
    elif product == 'orange':
        price = 0.85
    elif product == 'grapefruit':
        price = 1.45
    elif product == 'kiwi':
        price = 2.7
    elif product == 'pineapple':
        price = 5.50
    elif product == 'grapes':
        price = 3.85
    else:
        print('error')

elif day == 'Saturday' or day == 'Sunday':
    if product == 'banana':
        price = 2.7
    elif product == 'apple':
        price = 1.25
    elif product == 'orange':
        price = 0.9
    elif product == 'grapefruit':
        price = 1.60
    elif product == 'kiwi':
        price = 3
    elif product == 'pineapple':
        price = 5.60
    elif product == 'grapes':
        price = 4.20
    else:
        print('error')

total = price * quantity
print(f'{total:.2f}')