def bitone(n):
	cnt = 0
	m = n
	while m > 0:
		if m % 2 == 1:
			cnt += 1
		m = m / 2
	return cnt

def sugoroku(n):
	now = 1
	cnt = 1
	history = []
	flag = False
	while now < n:
		b = bitone(now)
		cnt += b
		if now + b > n:
			now -= b
		else:
			now += b
		if now in history:
			return -1
		else:
			history.append(now)
	
	return cnt

print sugoroku(int(raw_input()))