#include<iostream> #include<iomanip> #include<cmath> #include<string> #include<vector> #include<algorithm> #include<map> #include<set> #include<queue> #include<stack> using namespace std; typedef long long ll; #define fi first #define se second #define mp make_pair const int inf=1e9+7; const ll mod=1e9+7; int main() { ll P, Q; cin>>P>>Q; double l, m, r; l = 0; r = 1e20; for(int i=0;i<1000000;++i){ m = (l+r)/2; if(P+Q*m*log2(m)-m*m>0){ l = m; } else{ r = m; } } cout<<setprecision(20)<<l<<endl; }