#2CountOfBitsOne

import java.util.Scanner;

public class CountOfBitsOne {
    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int number = scan.nextInt();
        char[] binaryNum = (Integer.toBinaryString(number)).toCharArray();
        int counterOfBits = 0;
        for (int i = 0; i < binaryNum.length; i++) {
            if (binaryNum[i] == '1') {
                counterOfBits++;
            }
        }
        System.out.print(counterOfBits);
    }
}