Day 20.java

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

interface AdvancedArithmetic{
   int divisorSum(int n);
}
class Calculator implements AdvancedArithmetic {
    public int divisorSum(int n) {
        int s=0;
        for(int i=1;i<=n;i++)
        {
            if(n%i==0)
            {
                s+=i;
            }
        }
        return s;
    }
}

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);
    }
}