UVa10297 - Beavergnaw

#include <iostream>
#include <fstream>
#include <cmath>

using namespace std;

const double PI = acos(-1);

int main()
{
    double D, V, d, tmp;

#ifndef ONLINE_JUDGE
    ifstream cin("uva_in.txt");
#endif

	cout.precision(3);
    while (cin >> D >> V) {
        if (D == 0 && V == 0) break;

        tmp = D * D * D - V * 6 / PI;
        d = exp(log(tmp) / 3);
        cout << fixed << d << endl;
        
    }
    return 0;
}