d

town = input()
volume_sales = float(input())

procent = 0
total = 0
if town == 'Sofia':
    if 0 <= volume_sales <= 500:
        procent = 0.05
    elif 500 < volume_sales <= 1000:
        procent = 0.07
    elif 1000 < volume_sales <= 10000:
        procent = 0.08
    elif volume_sales > 10000:
        procent = 0.12
    total = volume_sales * procent


elif town == 'Plovdiv':
    if 0 <= volume_sales <= 500:
        procent = 0.055
    elif 500 < volume_sales <= 1000:
        procent = 0.08
    elif 1000 < volume_sales <= 10000:
        procent = 0.12
    elif volume_sales > 10000:
        procent = 0.145
    total = volume_sales * procent


elif town == 'Varna':
    if 0 <= volume_sales <= 500:
        procent = 0.045
    elif 500 < volume_sales <= 1000:
        procent = 0.075
    elif 1000 < volume_sales <= 10000:
        procent = 0.10
    elif volume_sales > 10000:
        procent = 0.13
    total = volume_sales * procent
if total > 0:
    print(f'{total:.2f}')
else:
    print('error')