import java.math.*;
import java.util.Scanner;

public class Main {

   public static void main(String[] args) {

	// create 2 BigInteger objects
	BigInteger bi1;  
	Scanner scan = new Scanner(System.in);
	bi1 = new BigInteger(scan.next());
	int i1 = bi1.bitCount();
	  
	String str1 = "" +i1;
	System.out.println( str1 );
   }
}