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<bits/stdc++.h>
using namespace std;
#define lp(i,n) for(int i=0;i<n;i++)
#define int long long
#define DEKAI 1000000007
#define INF (1<<28)
/* ┗(^o^)┛ｗｗｗｗｗ┏(^o^)┓ﾄﾞｺﾄﾞｺﾄﾞｺﾄﾞｺｗｗｗｗｗ */


signed main(){

	int n, m;
	double  ans;
	cin>>n>>m;

n = max(n,m);

ans = (double)4/3*3.14159265*pow(n,3);
	printf("%.8f\n", ans);
  	return 0;
}