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

int main() {
  cin.tie(0);
  ios::sync_with_stdio(false);
  
  double p, q;
  cin >> p >> q;
  
  double l = 0, r = 1e18;
  for (int i = 0; i < 200; i++) {
    double mid = (l + r) / 2;
    if (mid * mid < p + q * mid * log2(mid)) l = mid;
    else r = mid;
  }
  
  cout << fixed << setprecision(10) << l << '\n';
}