import java.math.BigInteger;
import java.util.Scanner;


class BitCount {

    public static void main(String[] args) {
        Scanner console = new Scanner(System.in);
        BigInteger bigInteger;
        int input;
        int result;

        input = console.nextInt();
        bigInteger = new BigInteger(String.valueOf(Integer.bitCount(input)));

        result = bigInteger.intValue();
        System.out.println(result);
    }
}