N, P = input().split()
N = int(N)
P = float(P)

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

ans = .0
for x in factor[2:]:
    ans += (1 - P) ** x
print(ans)