public class Bitcount {

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        Integer n = Integer.valueOf(Integer.parseInt(scanner.nextLine()));
        String bs = Integer.toBinaryString(n);
        int count = 0;
        for (int i = 0; i < args.length; i++) {
            if(bs.charAt(i) == '1') {
                count++;
            }
        }
        System.out.println(count);
        scanner.close();
    }
}