To make 1 kilogram of honey a bee should make 150000 flights,
cover 300000 kilometers and visit 10 million flowers.
There is a beehive at point (0; 0; 0). Not far from the hive there is
a grassland with flowers that should be considered as a triangle
with vertices (x_{1}; y_{1}; z_{1}), (x_{2}; y_{2}; z_{2}), and
(x_{3}; y_{3}; z_{3}).
A bee can fly to any point at distance no more than 100 meters from the
hive. Find the area of the grassland part, from which bees can
gather nectar.
Input
The first line contains coordinates x_{1}, y_{1}, z_{1}.
The second line contains coordinates x_{2}, y_{2}, z_{2}.
The third line contains coordinates x_{3}, y_{3}, z_{3}.
All the coordinates are integers and do not exceed 200 in their absolute values.
It is guaranteed that all three vertices of triangle are not on the same
line.
Output
Output the required area with an absolute or relative error no more than 10^{−2}.
Sample
input  output 

0 0 0
0 2 0
2 0 0
 2.00000

Problem Author: Mikhail Rubinchik
Problem Source: Open Ural FU Championship 2013