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

cnt = [0] * (n + 1)
for i in range(2, n + 1):
    for j in range(i * i, n + 1, i):
        cnt[j] += 1
        if j != i * i:
            cnt[j] += 1

ans = 0
for c in cnt[2:]:
    ans += pow(1 - p, c)
print(ans)