N, p = input().split()
N = int(N)
p = float(p)
ans = [1] * (N + 1)
ans[0] = ans[1] = 0
for i in range(2, N + 1):
	for j in range(2 * i, N + 1, i):
		ans[j] *= 1 - p
		
print(sum(ans))