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

commission = 0
is_valid = True
if city == "Sofia":
    if sales >= 0 and sales <= 500:
        commission = sales * 0.05
    elif sales > 500 and sales <= 1000:
        commission = sales * 0.07
    elif sales > 1000 and sales <= 10000:
        commission = sales * 0.08
    elif sales > 10000:
        commission = sales * 0.12
    else:
        is_valid = False


elif city == "Varna":
    if sales >= 0 and sales <= 500:
        commission = sales * 0.045
    elif sales > 500 and sales <= 1000:
        commission = sales * 0.075
    elif sales > 1000 and sales <= 10000:
        commission = sales * 0.1
    elif sales > 10000:
        commission = sales * 0.13
    else:
        is_valid = False


elif city == "Plovdiv":
    if sales >= 0 and sales <= 500:
        commission = sales * 0.055
    elif sales > 500 and sales <= 1000:
        commission = sales * 0.08
    elif sales > 1000 and sales <= 10000:
        commission = sales * 0.12
    elif sales > 10000:
        commission = sales * 0.145
    else:
        is_valid = False

else:
    is_valid = False

if is_valid:
    print(f"{commission:.2f}")
else:
    print("error")