#include <iostream>

using namespace std;


template <int i, int... Args>
struct Sum;

template <int i, int... Args>
struct Sum{
  static const int val = i + Sum<Args...>::val;
};

template <int i>
struct Sum<i>{
   static const int val = i;
};



int main()
{
  cout << "Sum<1,2,3,4> = " << Sum<1,2,3,4>::val << endl;
  return 0;
}