import java.util.*;
public class Main{
    public static void main(String[] args){
         Scanner scanner = new Scanner(System.in);
        int num = scanner.nextInt();
        int temp = num;
        int count = 0;
        while(temp > 0){
            if(temp % 2 == 1){
                count++;
            }
            temp /= 2;
        }
        System.out.println(count);
    }  
}