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


class BitCount {
    static Scanner console = new Scanner(System.in);

    public static void main(String[] args) {
        long input = 0L;
        BigInteger bigInteger;

        input = console.nextLong();

        bigInteger = new BigInteger(String.valueOf(Long.bitCount(input)));
        System.out.println(bigInteger);
    }
}