2232: Light Bulb

Memory Limit:128 MB Time Limit:1 S
Judge Style:Text Compare Creator:
Submit:12 Solved:7

Description

人左右走动,求影子L的最长长度。

Input

输入浮点数H、h、D

Output

输出最长L

Sample Input Copy

4 1 3

Sample Output Copy

1.000

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