<?php

$input = trim(fgets(STDIN));

//割り切れる数の最大値
$multiple_max = 1;

if (($input%2)==0){
    $multiple_max = $input / 2;
}else{
    $multiple_max = $input;
}

//集計
$mp  = $multiple_max;

//対象値
$max = $multiple_max;

do{
	if ($max%2==0){
	    $max = $max / 2;
	    $mp += $max;
	}else{
		$max = 0;
		$mp = $mp + 1;
	}
}while($max>0);

echo $mp . "\n";