n, p = map(float, raw_input().split())
# pro = [1.0 for i in range(int(n+1))]
n = int(n)
pro = [1.0] * (int(n))
l = range(2,int(n+1))
pri = []

while len(l) > 0:
    i = l.pop(0)
    pri.append(i)
    t = i*2
    # print t
    while t <= n:
        # print i, t
        # if t in l:
            # l.remove(t)
        pro[t-1] *= (1-p)
        t += i
# print pri
# print zip(pro, range(1,len(pro)+1))
print sum(pro) -1