fruit

product = input()
day = input()
quantity = float(input())
price = 0
if day in 'Monday, Tuesday, Wednesday, Thursday, Friday':
    if product == 'banana':
        price = 2.50
    elif product == 'apple':
        price = 1.20
    elif product == 'orange':
        price = 0.85
    elif product == 'grapefruit':
        price = 1.45
    elif product == 'kiwi':
        price = 2.70
    elif product == 'pineapple':
        price = 5.50
    elif product == 'grapes':
        price = 3.85
    else:
        print('error')

elif day in 'Saturday, Sunday':
    if product == 'banana':
        price = 2.70
    elif product == 'apple':
        price = 1.25
    elif product == 'orange':
        price = 0.90
    elif product == 'grapefruit':
        price = 1.60
    elif product == 'kiwi':
        price = 3.00
    elif product == 'pineapple':
        price = 5.60
    elif product == 'grapes':
        price = 4.20
    else:
        print('error')
else:
    print('error')

if price != 0:
    a = price * quantity
    print(f'{a:.2f}')