import math

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

divisor = [0] * (n + 1)
ans = 0.0

for k in range(2, n + 1):
    for m in range(k, n + 1, k):
        divisor[m] += 1
    ans += math.pow(1 - p, divisor[k] - 1)

print(ans)