#include <bits/stdc++.h>
#define all(vec) vec.begin(), vec.end()
#define pb push_back
#define eb emplace_back
#define fi first
#define se second
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
template <class T>
using V = vector<T>;
constexpr ll INF = (1LL << 30) - 1LL;
constexpr ll MOD = 1e9 + 7;
constexpr int dx[4] = {0, 1, 0, -1}, dy[4] = {1, 0, -1, 0};
template <class T>
void chmin(T &a, T b) { a = min(a, b); }
template <class T>
void chmax(T &a, T b) { a = max(a, b); }
void debug() { cerr << "ok" << endl; }
template <class T>
void printv(const vector<T> &v) {
    for (int i = 0; i < v.size(); i++) cout << v[i] << (i + 1 == v.size() ? '\n' : ' ');
}
template <class T>
void readv(vector<T> &v) {
    for (int i = 0; i < v.size(); i++) cin >> v[i];
}
int main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    double p, q;
    cin >> p >> q;
    double ok = 1, ng = (1LL << 60);
    int cnt = 100;
    while (cnt--) {
        double mid = (ok + ng) / 2.0;
        if (p + q * mid * log2(mid) >= mid * mid) {
            ok = mid;
        } else {
            ng = mid;
        }
    }
    cout << fixed << setprecision(15) << ok << '\n';
}