11. Fruit Shop

article = input()
day = input()
quantity = float(input())

if day == "Sunday" or day == "Saturday":
    if article == "banana":
        print(f"{quantity * 2.70:.2f}")
    elif article == "apple":
        print(f"{quantity * 1.25:.2f}")
    elif article == "orange":
        print(f"{quantity * 0.90:.2f}")
    elif article == "grapefruit":
        print(f"{quantity * 1.60:.2f}")
    elif article == "kiwi":
        print(f"{quantity * 3.00:.2f}")
    elif article == "pineapple":
        print(f"{quantity * 5.60:.2f}")
    elif article == "grapes":
        print(f"{quantity * 4.20:.2f}")
    else:
        print("error")
elif day == "Monday" or day == "Tuesday" or day == "Wednesday" or day == "Thursday" or day == "Friday":
    if article == "banana":
        print(f"{quantity * 2.50:.2f}")
    elif article == "apple":
        print(f"{quantity * 1.20:.2f}")
    elif article == "orange":
        print(f"{quantity * 0.85:.2f}")
    elif article == "grapefruit":
        print(f"{quantity * 1.45:.2f}")
    elif article == "kiwi":
        print(f"{quantity * 2.70:.2f}")
    elif article == "pineapple":
        print(f"{quantity * 5.50:.2f}")
    elif article == "grapes":
        print(f"{quantity * 3.85:.2f}")
    else:
        print("error")
else:
    print("error")