trade commission

town = input()
sales_volume = float(input())
commission = 0

if 0 <= sales_volume <= 500:
    if town == 'Sofia':
        commission = sales_volume * 0.05
    elif town == 'Varna':
        commission = sales_volume * 0.045
    elif town == 'Plovdiv':
        commission = sales_volume * 0.055


elif 500 <= sales_volume <= 1000:
    if town == 'Sofia':
        commission = sales_volume * 0.07
    elif town == 'Varna':
        commission = sales_volume * 0.075
    elif town == 'Plovdiv':
        commission = sales_volume * 0.08


elif 1000 <= sales_volume <= 10000:
    if town == 'Sofia':
        commission = sales_volume * 0.08
    elif town == 'Varna':
        commission = sales_volume * 0.10
    elif town == 'Plovdiv':
        commission = sales_volume * 0.12


elif sales_volume > 10000:
    if town == 'Sofia':
        commission = sales_volume * 0.12
    elif town == 'Varna':
        commission = sales_volume * 0.13
    elif town == 'Plovdiv':
        commission = sales_volume * 0.145

if commission > 0:
    print(f'{commission: .2f}')
else:
    print('error')