<?php
    function susumu($pos) {
        $dec = decbin($pos); //10進数→2進数変換 
        $dec_arr = str_split($dec); //2進数の値を区切る
        
        $susumu_kazu = 0;
        foreach($dec_arr as $v) {
            $susumu_kazu += intval($v); 
        }
        return $susumu_kazu;
    }
    
    $x = [];
    while ($line = fgets(STDIN)) {
        $x[] = explode(" ", trim($line)); //各行の値を変数xに代入、保管
    }
    
    // 調査対象キュー
    $queue[] = 1;
    
    // 最短手数を保存
    $stock = array_fill(0, $x[0][0] + 1, -1);
    $stock[1] = 1;
    
    $max = $x[0][0] + 1;

    while (!empty($queue)) {
        $data = array_shift($queue);
        $pos  = $data;
        $step = substr_count(decbin($pos), 1);
        
        $fwd  = $pos + $step;
        $back = $pos - $step;

        if (($stock[$fwd] == -1 || $stock[$fwd] > $stock[$pos] + 1) && $max >= $fwd) {
            $stock[$fwd] = $stock[$pos] + 1;
            $queue[] = $fwd;
        }
        
        if (($stock[$back] == -1 || $stock[$back] > $stock[$pos] + 1) && $back > 1) {
            $stock[$back] = $stock[$pos] + 1;
            $queue[] = $back;
        }
    }
    
    echo $stock[$x[0][0]];