N, p = input().split()
N = int(N)
p = float(p)
data = [-1] * (N + 1)
for i in range(2, N + 1):
    for j in range(i, N + 1, i):
        data[j] += 1

ans = 0
for i in range(2, N + 1):
    ans += (1 - p)**data[i]
print(ans)