fruit_shop

fruit = input()
day_of_the_week = input()
quantity = float(input())

price = 0
# 2.50  1.20    0.85    1.45    2.70    5.50    3.85
if day_of_the_week == "Monday" or day_of_the_week == "Tuesday" or day_of_the_week == "Wednesday"\
        or day_of_the_week == "Thursday" or day_of_the_week == "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
#2.70   1.25    0.90    1.60    3.00    5.60    4.20
elif day_of_the_week == "Saturday" or day_of_the_week == "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
total = quantity * price
print(f"{total:.2f}")
else:
    print("Error")