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);
        while(in.hasNext()){
            int s = in.nextInt();
            int count = 0;
            for(int i = 1;i<=s;i++){
                if(is_Perfect(i)==1){
                    count++;
                }
            }
            System.out.println(count);
        }
    }
    public static int is_Perfect(int i){
        int num = 0;
        for(int j=1;j<i;j++){
            if(i%j==0){
                num = num+j;
            }
        }
        if(num == i){
            return 1;
        }
        else{
            return 0;
        }
    }
}