题解 | #字符串字符匹配#

import java.util.*;

public class Main{
    public static void main(String [] args){
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        int count=0;
        for(int i = 4; i<=n;i++){
            if(i == calc(i)){
                count++;
            };
        }
        System.out.println(count);
    }
    
    public static int calc(int n){
        int sum = 1;
        for(int i=2; i<=Math.sqrt(n);i++){
            if(n%i == 0){
                sum+=i;
                sum+=n/i;
            }
        }
        return sum;
    }
}