N, p = input().split()
N, p = int(N), float(p)
divisors_cnt = [0] * (N + 1)

for i in range(1, N + 1):
    for j in range(i, N + 1, i):
        divisors_cnt[j] += 1

ans = 0
for i in range(2, N + 1):
    ans += (1 - p) ** (divisors_cnt[i] - 2)

print(ans)