frutMarket

frut = input().lower()
dey = input().lower()
col = float(input())
prais = -1
if (dey == "monday") or (dey == "tuesday") or dey == ("wednesday") or dey == ("thursday") or dey == "friday":
    if frut == "banana":
        prais = 2.5
        print("{0:.2f}".format(prais * col))
    elif frut == "apple":
        prais = 1.2
        print("{0:.2f}".format(prais * col))
    elif frut == "orange":
        prais = 0.85
        print("{0:.2f}".format(prais * col))
    elif frut == "grapefruit":
        prais = 1.45
        print("{0:.2f}".format(prais * col))
    elif frut == "kiwi":
        prais = 2.7
        print("{0:.2f}".format(prais * col))
    elif frut == "pineapple":
        prais = 5.5
        print("{0:.2f}".format(prais * col))
    elif frut == "grapes":
        prais = 3.85
        print("{0:.2f}".format(prais * col))
    else:
        print ("error")

elif dey == "saturday" or dey == "sunday":
    if frut == "banana":
        prais = 2.7
        print("{0:.2f}".format(prais * col))
    elif frut == "apple":
        prais = 1.25
        print("{0:.2f}".format(prais * col))
    elif frut == "orange":
        prais = 0.9
        print("{0:.2f}".format(prais * col))
    elif frut == "grapefruit":
        prais = 1.6
        print("{0:.2f}".format(prais * col))
    elif frut == "kiWi":
        prais = 3.0
        print("{0:.2f}".format(prais * col))
    elif frut == "pineapple":
        prais = 5.6
        print("{0:.2f}".format(prais * col))
    elif frut == "grapes":
        prais = 4.20
        print("{0:.2f}".format(prais * col))
    else:
        print ("error")
else:
    print ("error")