import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { public static void main(String[] args) { Scanner sc = new Scanner(System.in); while (sc.hasNext()){ int in = sc.nextInt(); String s = Integer.toBinaryString(in); System.out.println(s.replace("0","").length()); } } }