No.2070 Icosahedron
問題文最終更新日: 2022-08-20 00:09:44
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Problem Statement
Find the volume of a regular icosahedron with edge length $N$.
Constraints
- $N$ is an integer
- $1 \leq N \leq 10^4$
Input
The input is given from standard input in the following format.
$N$
Output
Print the answer on $1$ line. Do not forget the newline at the end.
Sample
Sample 1
Input
1
Output
2.18169499062491237350
Sample 2
Input
11
Output
2903.83603252175836913358
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