trade

# numbers = int(input())
# first_pair = 0
# current_pair = 0
# max_diff = 0
# is_equal = False
# for i in range(1, (numbers * 2) + 1):
#     number = int(input())
#     if i < 3:
#         first_pair += number
#     elif i > 2:
#         current_pair += number
#         if i % 2 == 0:
#             if current_pair == first_pair:
#                 is_equal = True
#                 first_pair = current_pair
#                 current_pair = 0
#                 continue
#             else:
#                 is_equal = False
#                 max_diff = abs(first_pair - current_pair)
#                 first_pair = current_pair
#                 current_pair = 0
# if is_equal or max_diff == 0:
#     print(f'Yes, value={first_pair}')
# else:
#     print(f'No, maxdiff={max_diff}')

# number = int(input())
#
# for i in range(2, number):
#     if number % i == 0:
#         print('Not Prime')
#         break
# else:
#     print('Prime')
#
# number = int(input())
# prime = True
# for i in range(2, number):
#     if number % i == 0:
#         prime = False
#         print('Not prime')
#         break
# else:
#     print('Prime')

# list_test = input().split()
# print(list_test, type(list_test))

# text = input()
# len_text = len(text)
# left_sum = 0
# right_sum = 0
# left_part = ''
# right_part = ''
# if len_text % 2 == 0:
#     left_part = text[:len_text//2]
#     right_part = text[len_text//2:]
# else:
#     left_part = text[:len_text // 2]
#     right_part = text[len_text // 2 + 1:]
# for i in range(len(left_part)):
#     left_sum += ord(left_part[i])
#     right_sum += ord(right_part[i])
#
# if left_sum >= right_sum:
#     print(f'Left part wins with {left_sum} points vs {right_sum} points')
# else:
#     print(f'Right part sum wins with {right_sum} points vs {left_sum} points')


# text = input()
#
# index_list = []
#
# for index in range(len(text)):
#     current_char = text[index]
#     if current_char.isalpha():
#         if current_char == current_char.upper():
#             index_list.append(index)
#
# print(index_list)

# string = input()
# str_list = []
# output = []
# for letter in string:
#     str_list.append(letter)
# for position in range(0, len(string)):
#     if str_list[position].isupper():
#         output.append(position)
# print(output)

# string = input()
# for char in string:
#     if char.isdigit():
#         print('Number')
#     elif char.isalpha():
#         print('Letter')
#     else:
#         print('Special symbol')

# if '#' not in string and \
#         '$' not in string \
#         and '&' not in string:

town = input()
sales_volume = float(input())
profit = 0
if town == "Sofia":
    if 0 <= sales_volume <= 500:
        profit = sales_volume * 0.05
    elif 500 < sales_volume <= 1000:
        profit = sales_volume * 0.07
    elif 1000 < sales_volume <= 10000:
        profit = sales_volume * 0.08
    elif sales_volume > 10000:
        profit = sales_volume * 0.12

elif town == "Varna":
    if 0 <= sales_volume <= 500:
        profit = sales_volume * 0.045
    elif 500 < sales_volume <= 1000:
        profit = sales_volume * 0.075
    elif 1000 < sales_volume <= 10000:
        profit = sales_volume * 0.10
    elif sales_volume > 10000:
        profit = sales_volume * 0.13

elif town == "Plovdiv":
    if 0 <= sales_volume <= 500:
        profit = sales_volume * 0.055
    elif 500 < sales_volume <= 1000:
        profit = sales_volume * 0.08
    elif 1000 < sales_volume <= 10000:
        profit = sales_volume * 0.12
    elif sales_volume > 10000:
        profit = sales_volume * 0.145

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