#include <iostream>


struct A
{
   int v = 3;
};


namespace Foo
{
   template <int k=11>
   int operator+(A const& rhs, A const& lhs)
   {
      return rhs.v + lhs.v + k;
   }
}

using Foo::operator+;


using namespace std;
int main()
{

   A a1, a2;

   cout << a1 + a2 << endl;

   return EXIT_SUCCESS;
}