n = gets.to_i

$nmoves = []
$bc = []

def bitcount(i)
  $bc[i] ||= i.to_s(2).count('1')
end

def move_from(i, n)
  return unless $nmoves[i]

  fwd = i + bitcount(i)
  $nmoves[fwd] = $nmoves[i] + 1 if fwd <= n

  back = i - bitcount(i)
  return if (back < 1) || $nmoves[back]
  $nmoves[back] = $nmoves[i] + 1
  move_from(back, n)
end

$nmoves[1] = 1
1.upto(n-1) do |i|
  move_from(i, n)
end
puts $nmoves[n] || -1