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

N,p = input().split()
N = int(N)
p = float(p)

ans = 0.0
for i in range(2, N+1):
    j = 2
    d_num = 0
    while j**2<=i:
        if i%j==0:
            d_num += 2 if j**2!=i else 1
        j += 1
    ans += (1-p)**d_num

print(ans)