time limit per test: 0.5 sec. memory limit per test: 65536 KB
input: standard output: standard
In this problem your task is very simple.
Consider two infinite cylinders in three-dimensional space, of radii R1 and R2 respectively, located in such a way that their axes intersect and are perpendicular.
Your task is to find the volume of their intersection.
Input
Input file contains two real numbers R1 and R2 (1 ≤ R1, R2 ≤ 100);
Output
Output the volume of the intersection of the cylinders. Your answer must be accurate up to 10-4.