trade commission

town = input()
sales = float(input())
commission = 0
if town == 'Sofia':
    if 0 <= sales <= 500:
        commission = sales*0.05
    elif 500 < sales <= 1000:
        commission = sales*0.07
    elif 1000 < sales <= 10000:
        commission = sales*0.08
    elif sales > 10000:
        commission = sales*0.12

elif town == 'Varna':
    if 0 <= sales <= 500:
        commission = sales*0.045
    elif 500 < sales <= 1000:
        commission = sales*0.075
    elif 1000 < sales <= 10000:
        commission = sales*0.10
    elif sales > 10000:
        commission = sales*0.13

elif town == 'Plovdiv':
    if 0 <= sales <= 500:
        commission = sales*0.055
    elif 500 < sales <= 1000:
        commission = sales*0.08
    elif 1000 < sales <= 10000:
        commission = sales*0.12
    elif sales > 10000:
        commission = sales*0.145
if commission > 0:
    print(f'{commission:.2f}')
else:
    print('error')