题解 | #完全数计算#

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 in = new Scanner(System.in);
        // 注意 hasNext 和 hasNextLine 的区别
        while (in.hasNext()) { // 注意 while 处理多个 case
            int num = in.nextInt();
            int b = 0;
            Main me = new Main();
            for (int i = 1; i <= num; i++) {
                b += me.IsPerfectNum(i);
            }
            System.out.println(b);
        }
    }
    int IsPerfectNum(int a) {
        int b = 0;
        for (int i = 1; i <= (a / 2); i++) {
            if (a % i == 0) {
                b += i;
            }
        }
        if (b == a) {
            return 1;
        } else {
            return 0;
        }
    }
}