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ABR0008 - Периметр

r радиустай тойрогт багтсан зөв n өнцөгтийн периметрийг ол. Пи тоог 3.14-тэй тэнцүү гэж үз.

Input

r - бутархай тоо ба n > 2 натурал тоонууд зайгаар тусгаарлагдан өгөгдөнө

Output

Периметрийн утга, таслалаас хойш нэг оронгийн нарийвчлалтайгаар

Example

Input:
10 6

Output:
60.0

Нэмсэн:sw40
Огноо:2007-10-16
Хугацааны хязгаарлалт:1s
Эх кодын хэмжээний хязгаарлалт:50000B
Memory limit:1536MB
Cluster: Cube (Intel G860)
Програмчлалын хэлүүд:Бүгд дараах хэлүүдээс бусад: ASM32-GCC MAWK BC C-CLANG NCSHARP CPP14 CPP14-CLANG COBOL COFFEE D-CLANG D-DMD DART ELIXIR ERL FANTOM FORTH GOSU GRV JS-RHINO JS-MONKEY JULIA KTLN NIM NODEJS OBJC OBJC-CLANG OCT PERL6 PICO PROLOG PYPY PYPY3 PY_NBC R RACKET RUST CHICKEN SQLITE SWIFT UNLAMBDA VB.NET
Эх сурвалж:Абрамов С. А.

hide comments
2010-04-02 17:16:11 Piotr KÄ…kol
Thank You Khuder. :-)
I got AC. :-D

Last edit: 2010-04-02 17:16:43
2010-02-27 10:42:49 SS
tomiyog ni mederh hun bnuu?
2010-02-26 06:14:57 SS
I don't understand
2009-09-20 05:54:17 sw40
Find the perimeter of the right-angled polygon with n vertex inscribed into the circle with radius r.
2009-04-04 18:34:17 Piotr KÄ…kol
Can somebody translate this problem into English for me? Because I'm Pole and I don't understand it. I will be thankful.
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