fruit shop

product = input()
day = input()
quantity = float(input())
price = 0
total_price = 0
if day == "Saturday" or "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
elif day == "Monday" or day == "Tuesday" or day == "Wednesday" or day == "Thursday" or day == "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

if price == 0:
    print('error')
else:
    total_price = price * quantity
    print(f"{total_price:.2f}")