from collections import deque

forward = [-1]
backward = [-1]

def count_one_bit(k):
  binary = bin(k)[2:]

  n_one_bit = 0
  for b in binary:
    if b == "1":
      n_one_bit += 1

  return n_one_bit

def main():
  global forward
  global backward

  N = int(input())

  # 各セルにおいて，前後に動いたときの移動先の番号を計算する
  for cell_num in range(1, N+1):
    n_one_bit = count_one_bit(cell_num)

    # 前に進んだ場合のセル位置
    if cell_num + n_one_bit <= N:
      forward.append(cell_num + n_one_bit)
    else:
      forward.append(-1)

    # 後ろに進んだ場合のセル位置
    if cell_num - n_one_bit >= 0:
      backward.append(cell_num - n_one_bit)
    else:
      backward.append(-1)

  # ゴール(N)にいけるマスがないなら，-1を返す
  if N not in forward:
    print(-1)
    return

  cells = []
  for i in range(N+1):
    cells.append(i)

  q = []
  reached = []

  for cell_num in range(1, N+1):
    if forward[cell_num] == N:
      q.append(cell_num)

  move = 1
  while len(q) != 0:
    new_q = []

    for item in q:
      if item in cells:
        cells.remove(item)
      if item == 1:
        print(move+1)
        return

      for cell_num in cells:
        if forward[cell_num] == item or backward[cell_num] == item:
          new_q.append(cell_num)

    q = new_q
    move += 1

  print(-1)

main()