#include<iostream>
using namespace std;
class Calculator {
  protected:
    int n; 
    int *arr; 
    double sum; 
  public:
    Calculator(int n) {
      this->n = n;
      arr = new int[n];
      sum = 0;
    }
    void inputNumbers() {
      cout << "\nEnter the " << n << " numbers:" << endl;
      for (int i = 0; i < n; i++) {
        cout << "Enter the number " << i + 1 << ": ";
        cin >> arr[i];
        sum += arr[i]; 
      }
    } 
    virtual void calculateSum() {
      cout << "Sum of " << n << " numbers: " << sum << endl;
    }
};
class Average : public Calculator {
  private:
    double avg;
  public:
    Average(int n) : Calculator(n) {
      avg = 0;
    }
    void calculateSum() override {
      Calculator::calculateSum();
      avg = sum / n; 
      cout << "Average of " << n << " numbers: " << avg << endl;
    }
};
int main() {
  int n;
  cout << "Enter the number of elements: ";
  cin >> n;
  Average a(n); 
  a.inputNumbers(); 
  a.calculateSum(); 
}