#include <iostream>

using namespace std;

int sum(int A[], int beg, int end)
{
  if (beg > end) return 0;
  return A[beg]+sum(A, beg+1, end);
}

main()
{
  int X[4] = {10, 20, 30, 40};

  cout << "Sum of {10, 20, 30, 40} is " << sum(X, 0, 3) << endl;
}