package main

import (
	"fmt"
	"math"
)

func main() {
	var N int
	var p float64
	fmt.Scan(&N, &p)
	d := divisorCounter(N)
	var ans float64
	for i := 2; i < N+1; i++ {
		if d[i] == 0 {
			ans += 1
		} else {
			ans += math.Pow(1-p, float64(d[i]))
		}
	}
	fmt.Println(ans)
}

func divisorCounter(n int) []int {
	d := make([]int, n+1)
	for i := 2; i < n+1; i++ {
		for j := i * 2; j < n+1; j += i {
			d[j]++
		}
	}
	return d
}