Problem: problem

Given the lengths of $ 2 $ sides that are not the hypotenuse of a right triangle, $ A $ and $ B $. The side of length $ A $ overlaps the $ x $ axis, and the side of length $ B $ overlaps the $ y $ axis.

Do the following:

1. Rotate the triangle around the $ x $ axis.
2. Rotate the shape created by performing the operation $ 1 $ around the $ y $ axis.



Perform the operation $ 2 $ to find the volume of the created figure.



output

Output the volume of the figure. Also, output a line break at the end. Absolute or relative errors less than $ 0.000001 $ are allowed.

Example

Input

1 2


Output

33.510322

Solution (in CPP):

Solution:
#include<cstdio>
#include<algorithm>
#include<functional>
#include<cmath>
using namespace std;
int main(void)
{
	int a,b,mx;
	double v;
	scanf("%d %d",&a,&b);
	mx=max(a,b);
	v=4.0/3.0*M_PI*mx*mx*mx;
	printf("%lf\n",v);
	return 0;
}