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

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

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

print(ans)