city = input()
sales = (float())

if sales >= 0 or sales <= 500:
    if city == "Sofia":
        print(sales * 0.5)
    elif city == "Varna":
        print(sales * 0.45)
    elif city == "Plovdiv":
        print(sales * 0.5)
elif sales > 500 or sales <= 1000:
    if city == "Sofia":
        print(sales * 0.7)
    elif city == "Varna":
        print(sales * 7.5)
    elif city == "Plovdiv":
        print(sales * 8)
elif sales > 1000 or sales <= 10000:
    if city == "Sofia":
        print(sales * 0.8)
    elif city == "Varna":
        print(sales * 10)
    elif city == "Plovdiv":
        print(sales * 12)
elif sales > 10000:
    if city == "Sofia":
        print(sales * 0.12)
    elif city == "Varna":
        print(sales * 0.13)
    elif city == "Plovdiv":
        print(sales * 0.14)
else:
    print("error")