def check_count(n):
	p_count = 0
	ans = 0

	if n == 1:
		return 1

	while 2**p_count <= n:
		p_count += 1

	if 2**(p_count - 1) == n:
		return (p_count - 1)
	else:
		ans = p_count - 1
		ans += check_count(n - 2**(p_count-1))
		return ans

n = int(input())

if n == 1:
	print(0)
else:
	print(check_count(n))