/* -*- coding: utf-8 -*-
 *
 * 425.cc: No.425 ジャンケンの必勝法 - 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 DELTA = 1e-8;

/* typedef */

typedef pair<double,double> pdd;

/* global variables */

/* subroutines */

/* main */

int main() {
  double p, q;
  cin >> p >> q;
  p /= 100, q /= 100;

  double wp = 1.0 / 3, lp = 1.0 / 3;
  queue<pdd> qq;
  qq.push(pdd(1.0 / 3, p));

  while (wp + lp < 1.0 - DELTA && ! qq.empty()) {
    pdd u = qq.front(); qq.pop();
    double &ud = u.first, &up = u.second;

    // use
    double d0 = ud * up / 2;
    if (d0 > 0.0) {
      wp += d0;
      qq.push(pdd(d0, max(up - q, 0.0)));
    }

    // do not use
    double d1 = ud * (1.0 - up) / 3;
    if (d1 > 0.0) {
      wp += d1;
      lp += d1;
      qq.push(pdd(d1, min(up + q, 1.0)));
    }
  }

  printf("%.7lf\n", wp);
  return 0;
}