题解 | #完全数计算#

import java.util.LinkedList;
import java.util.List;
import java.util.Scanner;

/**
 * @Classname PerfectNumber
 * @Description  完美数
 * @Date 2022/2/13 17:36
 * @Created by daihuhu
 */
public class Main {
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        while (scanner.hasNext()) {
            int n = scanner.nextInt();
            int count = 0;
            for (int i = 6; i <= n ; i++) {
                if(isPerfectNumber(i)) {
                    count++;
                }
            }
            System.out.println(count);
        }
    }

    private static boolean isPerfectNumber(int i) {
        int sum = 0;
        for (int j = 1; j < i; j++) {
            if(i % j == 0) {
                sum += j;
            }
        }
        if(sum == i){
            return true;
        }
        return false;
    }
}