0045. The observation post

Имя входного файла: post.in
Имя выходного файла: post.out
Ограничение по времени: 1 s
Ограничение по памяти: 64 megabytes

Once people have built an observation post on the surface of a spherical planet. Your task is to calculate total area visible from the top of this post.

Input file

The input file consits of two integer numbers R and h. R is a radius of the planet measured in meters. h is the height of the post. Both R and h are in range 1≤ R, h≤ 108.

Output file

Write to the output file total area of the part of planet surface visible from the top measured in square meters. Round the answer to the nearest integer.


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Источник: Petrozavodsk training camp, Summer 2002. Conclusive contest
Автор: Andrew Lopatin, Nick Durov

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