package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

func main() {
	P := readInt()
	Q := readInt()

	isOk := func(N float64) bool {
		return N <= float64(Q)*math.Log2(N)+float64(P)/N
	}

	ok := 1.0
	ng := float64(math.MaxInt64)
	for ng-ok > 0.00001 {
		m := ok + (ng-ok)/2
		if isOk(float64(m)) {
			ok = m
		} else {
			ng = m
		}
	}

	fmt.Println(ok)
}

const (
	ioBufferSize = 1 * 1024 * 1024 // 1 MB
)

var stdinScanner = func() *bufio.Scanner {
	result := bufio.NewScanner(os.Stdin)
	result.Buffer(make([]byte, ioBufferSize), ioBufferSize)
	result.Split(bufio.ScanWords)
	return result
}()

func readString() string {
	stdinScanner.Scan()
	return stdinScanner.Text()
}

func readInt() int {
	result, err := strconv.Atoi(readString())
	if err != nil {
		panic(err)
	}
	return result
}