interfaces.java

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

interface AdvancedArithmetic{
   int divisorSum(int n);
}
//Write your code here
   class Calculator implements AdvancedArithmetic{
       Calculator(){
       }
       
       public int divisorSum(int n){
            int sum = n;
            for (int i = 1, half = n/2; i <= half; i++) {
              if (n % i == 0) sum += i;
            }
            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);
    }
}