/**
 * Created by Singh on 04-01-2015.
 */
import java.util.*;
public class prog {
    public static void main(String args[])
    {
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        int count=0;
        while(a>0)
        {
            if(a%2==0)
                count++;
            a=a/2;
        }
        System.out.println(count);
    }
}