import java.util.Scanner;
public class TGMain {
    
    public static void main(String[] args){
        int a, b, c, N;
        boolean Flg = false;
        int ans = 0;
        Scanner sc = new Scanner(System.in);
        N = sc.nextInt();
        while(N != 0){
            
            if(N%2 == 1){
                ans += 1;
            }
            N /= 2;
            
        }
        System.out.println(ans);
    }
}