#include <iostream> #include <cstdio> #include <cmath> #include <ctime> #include <cstdlib> #include <cassert> #include <vector> #include <list> #include <stack> #include <queue> #include <deque> #include <map> #include <set> #include <bitset> #include <string> #include <algorithm> #include <utility> #define llint long long #define inf 1e18 #define rep(x, s, t) for(llint (x) = (s); (x) < (t); (x)++) #define Rep(x, s, t) for(llint (x) = (s); (x) <= (t); (x)++) #define chmin(x, y) (x) = min((x), (y)) #define chmax(x, y) (x) = max((x), (y)) using namespace std; typedef pair<llint, llint> P; llint p, q; int main(void) { //ios::sync_with_stdio(0); //cin.tie(0); cin >> p >> q; double ub = 1e18, lb = 1, mid; for(int i = 0; i < 100; i++){ mid = (ub+lb)/2; if(mid*mid < p+q*mid*log(mid)/log(2)) lb = mid; else ub = mid; } printf("%.11f\n", mid); return 0; }