# coding: utf-8
from Queue import Queue
INF = 1e9+7
N = int(raw_input())

def bc(x):
    return bin(x).count("1")

to_list = []
for i in range(1, N+1):
	bci=bc(i)
	temp_to = []
	if i-bci > 0:
		temp_to.append(i-bci-1)
	if i+bci < N+1:
		temp_to.append(i+bci-1)
	to_list.append(temp_to)

#bfsをするよ！
chk = [INF for _ in range(N)]
chk[0] = 1
que = Queue()
que.put(0)
while not que.empty():
	q = que.get()
	for i in to_list[q]:
		if chk[i] == INF:
			chk[i]=chk[q]+1
			que.put(i)

if chk[N-1] == INF:
	print '-1'
else:
	print chk[N-1]