`In Java 8 import java.io.; import java.util.;

interface AdvancedArithmetic{ int divisorSum(int n); } class Calculator implements AdvancedArithmetic { public int divisorSum(int n) { int sum=0; for(int i=1;i<=n;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);
}

} `