dsd

town = input()
moneyS = float(input())
comission = 0
if town == 'Sofia':
    if 0 <= moneyS <= 500:
        comission = 0.05 * moneyS
    elif 500 < moneyS <= 1000:
        comission = 0.07 * moneyS
    elif 1000 < moneyS <= 10000:
        comission = 0.08 * moneyS
    elif 10000 < moneyS:
        comission = 0.12 * moneyS
elif town == 'Varna':
    if 0 <= moneyS <= 500:
        comission = 0.045 * moneyS
    elif 500 < moneyS <= 1000:
        comission = 0.075 * moneyS
    elif 1000 < moneyS <= 10000:
        comission = 0.1 * moneyS
    elif 10000 < moneyS:
        comission = 0.13 * moneyS
elif town == 'Plovdiv':
    if 0 <= moneyS <= 500:
        comission = 0.055 * moneyS
    elif 500 < moneyS <= 1000:
        comission = 0.08 * moneyS
    elif 1000 < moneyS <= 10000:
        comission = 0.12 * moneyS
    elif 10000 < moneyS:
        comission = 0.145 * moneyS


if comission <= 0:
    print('error')
else:
    print(f'{comission:.2f}')