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

#ifdef LOCAL
#include "debug.h"
#else
#define DEBUG(...)
#endif

int main() {
  cin.tie(nullptr);
  ios::sync_with_stdio(false);
  double p, q;
  cin >> p >> q;
  double ok = 1, ng = 1e100;
  for (int _ = 1000; _--; ) {
    double mid = (ok + ng) / 2;
    (mid * mid < p + q * mid * log2(mid) ? ok : ng) = mid;
  }
  cout << fixed << setprecision(20) << ok << '\n';
}