$n = trim(fgets(STDIN));

$biscuit = 1;
$all = 0;
$answer = "";

for($i=1; $i<=$n; $i++) {
    if ($i == 1)  $biscuit = 1;
    else $biscuit = $all;

    $all = pocket($biscuit);

    if ($all == $n) {
        $answer = $i;
        break;
    } elseif ($all > $n)  {
        $amari = $all - $n;
        if ($amari == 1) {
            $answer = $i;
            break;
        } else {
            $res = $amari % 2;
            if ($res == 0) {
                $answer = $i;
            } else {
                $answer = $i + 1;
            }
            break;
        }
    }
}

function pocket($biscuit) {
    return $biscuit*2;
}


echo $answer."\n";