duration_of_contract = str(input())
type_of_contract = str(input())
mobile_internet = str(input())
count_months = int(input())

total_sum = 0
if duration_of_contract == "one":
    if type_of_contract == "Small":
        if mobile_internet == "yes":
            total_sum = (count_months * 9.98) + (5.50 * count_months)
        else:
            total_sum = count_months * 9.98
    elif type_of_contract == "Middle":
        if mobile_internet == "yes":
            total_sum = (count_months * 18.99) + (4.35 * count_months)
        else:
            total_sum = count_months * 18.99
    elif type_of_contract == "Large":
        if mobile_internet == "yes":
            total_sum = (count_months * 25.98) + (4.35 * count_months)
        else:
            total_sum = count_months * 25.98
    elif type_of_contract == "ExtraLarge":
        if mobile_internet == "yes":
            total_sum = (count_months * 35.99) + (3.85 * count_months)
        else:
            total_sum = count_months * 35.99

elif duration_of_contract == "two":
    if type_of_contract == "Small":
        if mobile_internet == "yes":
            total_sum = (count_months * 8.58) + (5.50 * count_months) * 0.9625
        else:
            total_sum = (count_months * 8.58) * 0.9625
    elif type_of_contract == "Middle":
        if mobile_internet == "yes":
            total_sum = (count_months * 17.09) + (5.50 * count_months) * 0.9625
        else:
            total_sum = (count_months * 17.09) * 0.9625
    elif type_of_contract == "Large":
        if mobile_internet == "yes":
            total_sum = (count_months * 23.59) + (5.50 * count_months) * 0.9625
        else:
            total_sum = (count_months * 23.59) * 0.9625
    elif type_of_contract == "ExtraLarge":
        if mobile_internet == "yes":
            total_sum = (count_months * 31.79) + (5.50 * count_months) * 0.9625
        else:
            total_sum = (count_months * 31.79) * 0.9625


print(f"{total_sum:.2f} lv.")