let i = require('fs').readFileSync('/dev/stdin', 'utf8').split('\n')[0]
let a = []
for (let c = 1; c <= i; c++) {
  let n = 0
  c.toString(2).split('').forEach((e) => e === '1' ? n++ : n)
  a.push(n)
}
let q = [0]
let m = [0]
let d = 1
let r = false
while (q.length > 0) {
  if (m.indexOf(a.length - 1) > -1) {
    r = true
    break
  }
  d++
  let t = q.concat()
  q = []
  t.forEach((e) => {
    let f = e + a[e]
    let b = e - a[e]
    if (f < a.length && m.indexOf(f) == -1) {
      m.push(f)
      q.push(f)
    }
    if (b > 0 && m.indexOf(b) == -1) {
      m.push(b)
      q.push(b)
    }
  })
}
console.log(r ? d : -1)