#エラトステネスのざる
import math

n , p = input().split()

N = int(n)
P = float(p)

l = [0] * (N + 1)

for i in range(2 , N + 1):
    for j in range(2 , N // i + 1):
        l[i * j] += 1
    
ans = 0

for i in l:
    ans += (1 - P) ** i


print(ans - 2)