/**
 * Created by n on 2017/06/11.
 */

import java.util.*


inline fun adjlist(i : Int) : Array<Int> {
    return arrayOf((i + 1) - Integer.bitCount(i + 1) - 1, (i + 1) + Integer.bitCount(i + 1) - 1)
}

fun main(args: Array<String>) {
    val cin = Scanner(System.`in`)
    val N = cin.nextInt()

    val inf = Integer.MAX_VALUE / 3
    val nil = Integer.MIN_VALUE / 3

    var q: Queue<Int> = ArrayDeque()
    val lst = Array(N, { i -> i })

    var d = Array(N, { inf })
    var pi = Array(N, { nil })
    var visited = BooleanArray(N)
    val s = 0

    d[s]       = 0
    visited[s] = true

    q.add(0)
    while (q.isNotEmpty()) {
        val u = q.remove()
        val adj = adjlist(u)
        for (v in adj) {
            if (v < 0 || v >= N || visited[v]) {
                continue
            }
            visited[v] = true
            d[v] = d[u] + 1
            q.add(v)
        }
    }
    val ans = if (d[N - 1] == inf) { -1 } else { d[N - 1] + 1}
    println("${ans}")
}