SPOJ.com - Problem GUESS005

GUESS005 - Guess the task V

..................................................................................................................................................................

...................................................n vertex....................................................................................................

..................................................................................................................................................................

.....................................................................................3,14.......................................................................

..................................................................................................................................................................

...................................................................................................................r..............................................

...........................................................................................

Example

Input:
10 6
Output:
60.0

Submit solution!

Added by:	Piotr Kąkol
Date:	2010-04-06
Time limit:	3s
Source limit:	50000B
Memory limit:	1536MB
Cluster:	Cube (Intel G860)
Languages:	All