<?php
$n = trim(fgets(STDIN));
$visited = array();
$ret = move(1, $visited, 1);
if ( $ret === FALSE ) {
	echo '-1'.PHP_EOL;
}
else {
	echo $ret.PHP_EOL;
}

function move ( $start, &$visited, $time ) {
	global $n;
	if (
		(array_search($start, $visited) !== FALSE) ||	// すでに訪問済
		($start < 1) ||									// 範囲外（マイナス方向）
		($start > $n)									// 範囲外（プラス方向）
	) {
		return FALSE;
	}
	$visited[] = $start;
	// ゴール到着
	if ( $start == $n ) {
		return $time;
	}
	
	$bit = decbin($start);
	$counts = count_chars($bit, 1);
	$count = $counts[ord('1')];
	$time++;
	return select_waypoint(move($start+$count, $visited, $time), move($start-$count, $visited, $time));
}

function select_waypoint($a, $b) {
	if ( $a === FALSE ) {
		return $b;
	}
	else if ( $b === FALSE ) {
		return $a;
	}
	else if ( ($a === FALSE) && ($b === FALSE) ) {
		return FALSE;
	}
	else {
		return min($a, $b);
	}
}