import math

s = input().split()
n = int(s[0])
p = float(s[1])

can = [1.0] * (n + 1)
pi = 1 - p
for k in range(2, n + 1):
    for i in range(k + k, n + 1, k):
        can[i] *= pi
res = sum(can[2:])

print(res)