tmp = input().split(" ")
N = int(tmp[0])
_p = float(tmp[1])
p = 1.0 - _p

count = [0] * (N+1)
for i in range(2, N//2+1):
    for j in range(2*i, N+1, i):
        count[j] += 1

ans = 0.0
for i in count[2:]:
    ans += p ** i
print(ans)