import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.math.BigInteger;
import java.util.Scanner;

public class Main {
    public static void main(String[] args) {
        BufferedReader reader=new BufferedReader(new InputStreamReader(System.in));
        try {
            System.out.println(new BigInteger(reader.readLine()).bitCount());
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}