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;
typedef long long ll;

const double pi = 3.14159265358979;

signed main(){
    ios::sync_with_stdio(false);
	cin.tie(0);
    cout << fixed << setprecision(20);

    double a,b;
    cin>>a>>b;
    double r = max(a,b);
    double ans = 4.0/3.0 * pi * r*r*r;
    cout << ans << endl;
    
}