fruit

fruit = input()
day = input()
qty = float(input())
price = 0
condition = True
if day in 'Monday Tuesday Wednesday Thursday Friday':
    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
    else:
        condition = False

elif day in 'Saturday Sunday':
    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
    else:
        condition = False
else:
    condition = False

if condition:
    total = price * qty
    print(f'{total:.2f}')
else:
    print('error')