/* -*- coding: utf-8 -*-
 *
 * 1042.cc:  No.1042 愚直大学 - yukicoder
 */

#include<cstdio>
#include<cstdlib>
#include<cstring>
#include<cmath>
#include<iostream>
#include<string>
#include<vector>
#include<map>
#include<set>
#include<stack>
#include<list>
#include<queue>
#include<deque>
#include<algorithm>
#include<numeric>
#include<utility>
#include<complex>
#include<functional>
 
using namespace std;

/* constant */

const double MAX_N = 1e12;
const int CNT = 1000;

/* typedef */

/* global variables */

/* subroutines */

/* main */

int main() {
  int p, q;
  scanf("%d%d", &p, &q);

  double n0 = 1.0, n1 = MAX_N;
  for (int cnt = 0; cnt < CNT; cnt++) {
    double n = (n0 + n1) / 2;
    if (n * n > p + q * n * log2(n)) n1 = n;
    else n0 = n;
  }

  printf("%.9lf\n", n0);
  return 0;
}