题解 | #完全数计算#

import java.util.*;

public class Main {
    public static void main(String[] args) {
        Scanner in = new Scanner(System.in);
        int b = in.nextInt();
        int num = 0;
        for(int i =2; i< b; i++) {
            List<Integer> list = new ArrayList<>();
            for(int j=2; j<i;j++) {
                if(j > i/2) {
                    break;
                }
                if(i%j == 0) {
                    list.add(j);
                }
            }
            int max = i - 1;
            for(int j=0; j<list.size(); j++ ) {
                max -= list.get(j);
            }
            if(max == 0) {
                num++;
            }
        }
        System.out.println(num);
    }
}