#include <bits/stdc++.h>
using namespace std;

int main() {
    int p, q;
    cin >> p >> q;
    cout << setprecision(17);
    double l = 1, r = 1e19;
    while (r / l > 1.00000001) {
        double n = sqrt(r * l);
        if (n * n > p + q * n * log(n) / log(2.0)) {
            r = n;
        } else {
            l = n;
        }
    }
    cout << sqrt(r * l) << endl;
}