town = input()
sales = float(input())

commission = 0

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

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

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

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

if commission == 0 or (town != 'Sofia' and town !='Plovdiv' and town != 'Varna'):
    print('error')
else:
    income = sales * commission
    print(f'{income:.2f}')