12. Trade Commissions

city = input()
volume = float(input())

salary = 0
if city == "Sofia":
    if 0 <= volume <= 500:
        salary += volume * 0.05
    elif 500 <= volume <= 1000:
        salary += volume * 0.07
    elif 1000 < volume <= 10000:
        salary += volume * 0.08
    elif volume > 10000:
        salary += volume * 0.12

if city == "Varna":
    if 0 <= volume <= 500:
        salary += volume * 0.045
    elif 500 < volume <= 1000:
        salary += volume * 0.075
    elif 1000 < volume <= 10000:
        salary += volume * 0.1
    elif volume > 10000:
        salary += volume * 0.13


if city == "Plovdiv":
    if 0 <= volume <= 500:
        salary += volume * 0.055
    elif 500 < volume <= 1000:
        salary += volume * 0.08
    elif 1000 <= volume <= 10000:
        salary += volume * 0.12
    elif volume > 10000:
        salary += volume * 0.145


if city != "Varna" and city != "Sofia" and city != "Plovdiv" or volume < 0:
    print("error")
else:
    print(f'{salary:.2f}')