Day19.java

import java.io.*;
import java.util.*;

interface AdvancedArithmetic{
   int divisorSum(int n);
}

//Write your code here
class Calculator implements AdvancedArithmetic{
    public int divisorSum(int n){
        ArrayList<Integer> divisors = new ArrayList<>();
        int sum = 0;
        for(int i=1; i<=n; i++){
            if(n%i == 0)
                divisors.add(i);
        }
        for(Integer div : divisors)
            sum += div;
        return sum;
    }
}

class Solution {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        scan.close();
        
      	AdvancedArithmetic myCalculator = new Calculator(); 
        int sum = myCalculator.divisorSum(n);
        System.out.println("I implemented: " + myCalculator.getClass().getInterfaces()[0].getName() );
        System.out.println(sum);
    }
}