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

public class Main {

   public static void main(String[] args) {
InputStreamReader isr = new InputStreamReader(System.in);
	// create 2 BigInteger objects
	BigInteger bi1;  
	BufferedReader scan = new BufferedReader(isr);
	int i1 = 0;
	try { bi1 = new BigInteger(scan.readLine()); i1 = bi1.bitCount(); } catch (IOException e) {}
	  
	String str1 = "" +i1;
	System.out.println( str1 );
   }
}