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    **JAVA SOLUTION |||| USE JAVA 8 OR 7 **

    final class MyCalculator implements AdvancedArithmetic{
        int divisor;
        @Override
        
        public int divisor_sum(int n) {
            
            for (int i = 1; i <= n; i++) {
                if(n%i == 0){
                    divisor += i;
                }
            }        
            return divisor;
            
        }
    }
    //Write your code here