def div(x, p):
    z, idx, cnt = 0, 2, 0
    while idx * idx <= x:
        if x % idx == 0:
            z += p * (1-p) ** cnt
            cnt += 1
            if x // idx != idx:
                z += p * (1 - p) ** cnt
                cnt += 1

        idx += 1

    return z


def main():
    n, p = map(float, input().split())

    num = 0
    for i in range(2, int(n)+1):
        num += div(i, p)

    print(n-1-num)


if __name__ == '__main__':
    main()