fruit

fruit = input()
day = input()
quantity = float(input())
final_price = 0
price_banana = 0
price_apple = 0
price_orange = 0
price_grapefruit = 0
price_kiwi = 0
price_pineapple = 0
price_grapes = 0
if day in "Monday Tuesday Wednesday Thursday Friday":
    price_banana = 2.50
    price_apple = 1.20
    price_orange = 0.85
    price_grapefruit = 1.45
    price_kiwi = 2.70
    price_pineapple = 5.50
    price_grapes = 3.85
elif day in "Saturday Sunday":
    price_banana = 2.70
    price_apple = 1.25
    price_orange = 0.90
    price_grapefruit = 1.60
    price_kiwi = 3.00
    price_pineapple = 5.60
    price_grapes = 4.20

if fruit == "banana":
    final_price = price_banana * quantity

elif fruit == "apple":
    final_price = price_apple * quantity
elif fruit == "orange":
    final_price = price_orange * quantity
elif fruit == "grapefruit":
    final_price = price_grapefruit * quantity
elif fruit == "kiwi":
    final_price = price_kiwi * quantity
elif fruit == "pineapple":
    final_price = price_pineapple * quantity
elif fruit == "grapes":
    final_price = price_grapes * quantity

if day not in "Monday Tuesday Wednesday Thursday Friday " \
              "Saturday Sunday" or fruit not in "banana apple orange grapefruit kiwi pineapple grapes":
    print("error")
else:
    print(f"{final_price:.2f}")