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#include <iostream>
#include <cmath>
#include <iomanip>

using namespace std;

long double pi = 3.14159265358979323846;

long double volume(long double h, long double r) {
    return pi * h * h * (r - h/3);
}

long double find_height(long double r, long double v) {
    long double low = 0, high = r;
    long double eps = 1e-18;

    while (high - low > eps) {
        long double mid = (low + high) / 2;
        if (volume(mid, r) < v) {
            low = mid;
        } else {
            high = mid;
        }
    }
    return low;
}

int main() {
    long double r, v;
    cin >> r >> v;

    long double h = find_height(r, v);
    cout << fixed << setprecision(7) << h << endl;

    return 0;
}
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