package main

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

var sc = bufio.NewScanner(os.Stdin)
var rdr = bufio.NewReaderSize(os.Stdin, 1000000)

func main() {
	sc.Split(bufio.ScanWords)
	n, p := nextInt(), nextFloat()
	a := make([]float64, n+1)
	for i := 2; i <= n/2; i++ {
		for j := i * 2; j <= n; j += i {
			a[j]++
		}
	}

	ans := float64(0)
	for i := 2; i <= n; i++ {
		if a[i] == 0 {
			ans++
			continue
		}
		ans += math.Pow(1-p, a[i])
	}
	fmt.Println(ans)
}

func nextLine() string {
	sc.Scan()
	return sc.Text()
}

func nextInt() int {
	i, _ := strconv.Atoi(nextLine())
	return i
}

func nextFloat() float64 {
	f, _ := strconv.ParseFloat(nextLine(), 64)
	return f
}