fruit=input()
day=input()
quantity=float(input())
price=0
if day=="Sunday" or day=="Saturday":
    if fruit=="banana":
        price=2.70
    elif fruit=="apple":
        price=1.25
    elif fruit=="orange":
        price=.9
    elif fruit=="grapefruits":
        price=1.6
    elif fruit=="kiwi":
        price=3.00
    elif fruit == "pineapple":
        price=5.60
    elif fruit == "grapefruits":
        price=4.20
elif day=="Monday" or day=="Tuesday" or day=="Wensday" or day=="Thuesday" or day=="Friday":
    if fruit=="banana":
        price=2.50
    elif fruit=="apple":
        price=1.20
    elif fruit=="orange":
        price=.85
    elif fruit=="grapefruits":
        price=1.45
    elif fruit=="kiwi":
        price=2.70
    elif fruit == "pineapple":
        price=5.50
    elif fruit == "grapefruits":
        price=3.85
sum=quantity*price
print(f"{sum:.2f}")
else:
print("error")