def go(n):
	ary = list(format(n,'b'))
	g = sum([int(a) for a in ary])
	return g


def sugoroku(val=11):
	dic = {a:True for a in range(val)}
	i=1
	count = 1
	while i<val:
		g = go(i)
		if val == i+g:
			count +=1
			print(count)
			break
		else:
			if dic[i]:
				if val < i+g:
					dic[i] = False
					i = i-g
					count +=1
				else:
					dic[i] = False
					i = i+g
					count +=1
			else:
				print("-1")
				break
		#print(i)

val = input()
sugoroku(int(val))