import java.util.Scanner;

public class prog {
	public static int bitCount(int n) {
		int count = 0;
		
		while (n != 0 && n != 1) {
			if (n % 2 == 1) {
				count++;
			}
			
			n /= 2;
		}
		
		if (n == 1) {
			count++;
		}
		
		return count;
	}
	
	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		int n = s.nextInt();
		
		System.out.println(bitCount(n));
		
		s.close();		
	}
}