town = input()
sells = float(input())
commision = 0

if town == 'Sofia':
    if sells <= 0 and sells <= 500:
        commision = sells * 0.050
    elif sells < 500 and sells <= 1000:
        commision = sells * 0.070
    elif sells > 1000 and sells <= 10000:
        commision = sells * 0.080
    elif sells > 12000:
        commision = sells * 0.012
    print(f'{commision:.2f}')

elif town == 'Varna':
    if sells <= 0 and sells <= 500:
        commision = sells * 0.045
    elif sells > 500 and sells <= 1000:
        commision = sells * 0.075
    elif sells > 1000 and sells <= 10000:
        commision = sells * 0.10
    elif sells > 12000:
        commision = sells * 0.13
    print(f'{commision:.2f}')

elif town == 'Plovdiv':
    if sells <= 0 and sells <= 500:
        commision = sells * 0.55
    elif sells > 500 and sells <= 1000:
        commision = sells * 0.80
    elif sells > 1000 and sells <= 10000:
        commision = sells * 0.120
    elif sells > 12000:
        commision = sells * 0.145
    print(f'{commision:.2f}')


else:
    print('error')