Fruit shop 11/5

fruit = input()
day=input()
cnt = float(input())

price = 0

if day in ("Monday  Tuesday  Wednesday  Thursday  Friday"):
    if fruit == "banana":
        price = cnt * 2.50
    elif fruit == "apple":
        price = cnt * 1.20
    elif fruit == "orange":
        price = cnt * 0.85
    elif fruit == "grapefruit":
        price = cnt * 1.45
    elif fruit == "kiwi":
        price = cnt * 2.70
    elif fruit == "pineapple":
        price = cnt * 5.50
    elif fruit == "grapes":
        price = cnt * 3.85

elif day in ("Saturday Sunday"):
    if fruit == "banana":
        price = cnt * 2.70
    elif fruit == "apple":
        price = cnt * 1.25
    elif fruit == "orange":
        price = cnt * 0.90
    elif fruit == "grapefruit":
        price = cnt * 1.60
    elif fruit == "kiwi":
        price = cnt * 3
    elif fruit == "pineapple":
        price = cnt * 5.60
    elif fruit == "grapes":
        price = cnt * 4.20

if price > 0:
    print(f"{price:.2f}")
else:
     print("error")