There are M circles (0 ≤ M ≤ 100) on a plane. Some circles can have zero radius. The task is to calculate the area of minimum convex domain containing all the circles.
The input contains the description of one test including:
The output contains a single line with the result given with accuracy 10-4.
4 0 0 1 0 4 1 4 4 1 4 0 1
35.1416