<?php
$N = (int)fgets(STDIN);

$pow = 0;
$digit = 0;
$bin = 1;
$n = $N;
while ($n > 1) {
    $pow++;
    $n = (int)($n/2);
    $bin *= 2;
}

if ($N === $bin) {
    echo "$pow\n";
} else if (($N - $bin) === 1) {
    echo ($pow + 1) . "\n";
} else if (($N - $bin) % 2 === 1) {
    echo ($pow + 2) . "\n";
} else {
    echo ($pow + 1) . "\n";
}