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 scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        int count =0;
        for (int i = 1; i <= n; i++) {
            if (isPerfect(i)){
                count++;
            }

        }
        System.out.println(count);
    }
    //判断是否是完全数
    public static boolean isPerfect(int num){
        int sum =0;
        for (int i = 1; i < num; i++) {
            if (num%i==0){
                sum+=i;
            }
        }
        return sum==num;
    }
}