# ATM

 import sys

 withdraw, balance = map(float, sys.stdin.readline().strip().split())  # strip()用法去除结尾的\n符号

 if int(withdraw) % 5 != 0 or balance < (withdraw + 0.5):  # 1.注意手续费,缺少手续费也不能取 2.xy0~2000是测试值要求，不用判断

     print("%.2f" % balance)

 else:

     print("%.2f" % (balance - withdraw - 0.5))

学习

　　数据

　　　　类型要求

　　　　　　map转float

　　　　精读输出

　　　　　　"%.2f"

　　　　读取

　　　　　　sys标准库的引入, stdlib/io

　　　　　　用split()一次读取两个

犯错

　　\n尾部符号去掉

　　py缩进注意

　　0.5手续费

　　中文字符混入犯错

　　系统内含的测试数据规格，很多都不用自己多加一道判断了

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