#include <bits/stdc++.h>
using namespace std;
#define rep(i, n) for (int i = 0; i < (int)(n); i++)
#define llong long long

bool isTakahashi(double n, double p, double q) {
    return n < p / n + q * log2(n);
}

int main() {
    double p, q;
    cin >> p >> q;

    double lower = 1.0;
    double upper = 2.0 + 1.0*1e11;
    rep(i, 100) {
        double middle = (lower + upper) / 2.0;
        if(isTakahashi(middle, p, q)) lower = middle;
        else upper = middle;
    }
    printf("%.6f\n", upper);
}