URI Online Judge | 2584

Pentagon

By Ricardo Martins, IFSULDEMINAS BR Brazil

Timelimit: 1

It is possible to calculate the area of ​​a regular pentagon, that is, a geometric figure with five equal sides, given the length of one side. So, do it.

Pentagono

Write a program that, given the length of one side of a regular pentagon, computes your area.

Input

There will be a value C that indicates the number of test cases. Then there will be an integer N for each case (1 ≤ N ≤ 10000), indicating the length of the side of a regular pentagon.

Output

For each test case, print the corresponding value of the area of ​​the respective pentagon, with three decimal digits of precision.

Input Sample Output Sample

3
1
2
3

1.720
6.882
15.484