import java.util.*;
import java.lang.*;
import java.io.*;
import java.math.BigInteger;
class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		 Scanner scan = new Scanner(System.in);
    String str = scan.next();
		// your code goes here
		BigInteger n = new BigInteger(str);
		System.out.println(n.bitCount());
	}
}