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    public class Solution {

    public static void main(String[] args) {
        /* Enter your code here. Read input from STDIN. Print output to STDOUT. Your class should be named Solution. */
        Scanner scan = new Scanner(System.in);
        int n = scan.nextInt();
        MyCalculator mycalculator = new MyCalculator();
        System.out.println("I implemented: AdvancedArithmetic");
        System.out.print(mycalculator.divisor_sum(n));
    }
    

    }

    interface AdvancedArithmetic { int divisor_sum(int n); }

    class MyCalculator implements AdvancedArithmetic{ int suma =0; public int divisor_sum(int n){ for(int i=1; i<=n; i++){ if(n%i==0){ suma+=i; } } return suma; } }