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

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