#include <bits/stdc++.h>
using namespace std::literals::string_literals;
using i64 = std::int_fast64_t;
using std::cout;
using std::cerr;
using std::endl;
using std::cin;

template<typename T>
std::vector<T> make_v(size_t a){return std::vector<T>(a);}

template<typename T,typename... Ts>
auto make_v(size_t a,Ts... ts){
  return std::vector<decltype(make_v<T>(ts...))>(a,make_v<T>(ts...));
}

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

	long double ok = 1, ng = 1LL << 60, EPS = 1e-9;
	for(int i = 0; i < 100; i++) {
		long double mid = sqrtl(ok * ng);

		if(mid * mid - ((long double)p + (long double)q * mid * log2l(mid)) < EPS) ok = mid;
		else ng = mid;
	}
	
	printf("%.12Lf\n", ok);
	return 0;
}