import java.util.Scanner;

public class b {
	public static void main(String args[]){
		Scanner sc = new Scanner(System.in);
		long N = sc.nextLong();
		int cnt = 0;
		cnt += N % 2;
		while(N > 0){
			N /= 2;
			cnt += N % 2;
		}
		System.out.println(cnt);
	}
}