Trade Comission

town = input().lower()
sells = float(input())

small = 0 <= sells <= 500
normal = 500 < sells <= 1000
big = 1000 < sells <= 10000
ultra = sells > 10000

if small:
    if town == "sofia":
        print(f"{(sells * 0.05):.2f}")
    elif town == "varna":
        print(f"{(sells * 0.045):.2f}")
    elif town == "plovdiv":
        print(f"{(sells * 0.055):.2f}")
    else:
      print("error")
elif normal:
    if town == "sofia":
        print(f"{(sells * 0.07):.2f}")
    elif town == "varna":
        print(f"{(sells * 0.075):.2f}")
    elif town == "plovdiv":
        print(f"{(sells * 0.08):.2f}")
    else:
      print("error")
elif big:
    if town == "sofia":
        print(f"{(sells * 0.08):.2f}")
    elif town == "varna":
        print(f"{(sells * 0.1):.2f}")
    elif town == "plovdiv":
        print(f"{(sells * 0.12):.2f}")
    else:
      print("error")
elif ultra:
    if town == "sofia":
        print(f"{(sells * 0.12):.2f}")
    elif town == "varna":
        print(f"{(sells * 0.13):.2f}")
    elif town == "plovdiv":
        print(f"{(sells * 0.145):.2f}")
    else:
      print("error")
else:
    print("error")