#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;
}