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_lst = np.full(N - 1, 1 - P)
ans_lst **= factor[2:]
print(ans_lst.sum())