<?php
$max = trim(fgets(STDIN));
$n = 1;
$hit = 0;
while ( $n < $max ) {
	if ( ($n*2) > $max ) {
		while ( ($n*2) <= $max) {
			$n--;
			$max--;
		}
	}
	$n *= 2;
	$hit++;
}
echo $hit.PHP_EOL;