import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        String bine = new java.math.BigInteger(sc.next()).toString(2);
        int count = 0;
        for (char c : bine.toCharArray())  {
            if (c == '1') {
                count++;
            }
        }
        System.out.println(count);
    }
}