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

    # a[k]:1とk自身を除くkの約数の個数
    a = [0 for i in range(n+1)]
    for i in range(2, n+1):
        for j in range(2*i, n+1, i):
            a[j] += 1

    num = 0
    for i in range(2, n+1):
        num += (1-p) ** a[i]

    print(num)


if __name__ == '__main__':
    main()