import numpy as np

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

factor = np.zeros(N + 1, dtype=int)
for i in range(2, N + 1):
    factor[i * 2:N + 1:i] += 1

ans = .0
for x in factor[2:]:
    ans += pow(1 - P, x)
print(ans)