#include <iostream>
#include <tuple>

using namespace std ;



template < int... Rest>
constexpr int sum_sequence()
{
   return ( 0  + ... + Rest )  ;

}



int main()
{
      int result = sum_sequence< 1 , 2,  5, 6 >()  ;
      cout << "result:" << result << endl ;
      return 0;
}