int checkSerial( int left, int right) 
{
  if (left == right || right == 5) {
    if (left == 0) {
      return 0;
    } else {
      if (left == 3) {
	return 1;
      } else {
	return 2;
      }
    }
  }
  return 0;
}
 
int  CheckSerial( int left, int right) 
{
  if (left == right || right == 5)
    if (left == 0)  return 0;
    else
      if (left == 3) return 1;
  else return 2;

  return 0;
}