<?php

$n 			= trim(fgets(STDIN));
$pos 		= 1;	// 現在位置
$count 		= 1;	// 移動回数
$visited 	= 0;	// 訪問済位置

while($n != 1){
	if (move($pos) == $n ){
		$count++;
		break;
	} elseif (move($pos) > $n){
		$pos -= substr_count(decbin($pos),1,0);
		if ($pos == $visited){
			$count = -1;
			break;
		}
		$visited = $pos;
		$count++;
	}
	$pos = move($pos);
	$count++;
}
	echo $count .PHP_EOL;

function move($param){
 	$param += substr_count(decbin($param),1,0);
 	return $param;
}