import java.util.Scanner; // 注意类名必须为 Main, 不要有任何 package xxx 信息 public class Main { //i&(i-1)可以去除最右边的1个1 public static void main(String[] args) { Scanner sc = new Scanner(System.in); while (sc.hasNextInt()) { int n = sc.nextInt(); int j = n, count = 0; while (j != 0) { j = j & (j - 1); count++; } System.out.println(count); } } }