# -*- coding:utf-8 -*-

if __name__ == "__main__":
	n,p = map(float,raw_input().split())
	n = int(n)
	a = [0 for i in xrange(n+1)]
	for i in xrange(2,n+1):
		k = i * 2
		while k <= n:
			a[k] += 1
			k+=i
	ans = 0
	for i in xrange(2,n+1):
		if a[i] == 0:
			ans += 1
		else:
			ans += pow(1-p,a[i])
	print ans