**Description**

4408. Build a Fence

There is a wall in your backyard. It is so long that you can’t see its endpoints. You want to build a fence of length L such that the area enclosed between the wall and the fence is maximized. The fence can be of arbitrary shape, but only its two endpoints may touch the wall.

**Input Specification**

The input consists of several test cases.

For every test case, there is only one integer L (1<=L<=100), indicating the length of the fence. The input ends with L=0.

**Output Specification**

For each test case, output one line containing the largest area. Your answer should be rounded to 2 digits after the decimal point.

**Sample Input**

1

7

0

**Sample Output**

0.16

7.80

**Solution** (File: 4408.py)

#### Solution

Runs < 0.001 seconds in Python 2.7.Use this link to get the Project Euler Solution Python 2.7 source.

**Comments**

The test cases are qualified to match the input specification.

## Discussion

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