interface.cpp

#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
#include <string>
using namespace std;
class AdvancedArithmetic{
 public:
 virtual int divisorSum(int n)=0;
};

class Calculator : public AdvancedArithmetic{
 int divisorSum(int n)
 {
 int t=0,i;
 for(i=1;i<=n;i++)
 {
 if(n%i == 0)
 t += i;
 }
 return t;
 }
};

int main(){
 int n;
 cin >> n;
 AdvancedArithmetic *myCalculator = new Calculator(); 
 int sum = myCalculator->divisorSum(n);
 cout << "I implemented: AdvancedArithmetic\n" << sum <<endl;
 return 0;
}