题解 | 二进制数1

import java.util.Scanner;

/**
 * @author supermejane
 * @date 2025/10/11 15:14
 * @description  BGN80 二进制数1
 */
public class Main {

    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        long n = in.nextLong(), result =  0;
        while (n > 0) {
            result += n & 1;
            n = n >> 1;
        }
        System.out.println(result);
    }
}