class bruch;
struct bruch;

class bruch
{
  int z;
  int n;

public:
  int Z ();
  int N ();
  void Z (int z);
  void N (int n);

  bruch operator + (bruch const &rhs);

  bruch (int z_in, int n_in)
  : z (z_in)
  , n (n_in)
  {
  }
};

bruch
bruch::operator + (bruch const &rhs)
{
  bruch ret (0, 0);
  ret.z = rhs.n * this->z + this->n * rhs.z;
  ret.n = this->n * rhs.n;
  return ret;
}

int
bruch::Z ()
{
  return this->z;
}

int
bruch::N ()
{
  return n;
}

int
main ()
{
  bruch b1 (1, 3);
  bruch b2 (2, 5);
  b1 + b2;
  b1.operator + (b2);
}