import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.Scanner;

class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		int k=0, n;
		Scanner in = new Scanner(System.in);
		n = in.nextInt();
		while (n > 0){   
			k += (n % 2);
			n = n / 2;
		}
		System.out.print(k);
	}
}