void grunITS (Int_t nevent=1, const char *config="Config.C")
{
  //
  // Simple macro to run aliroot in a batch mode
  //
  gAlice->Init(config);
  TStopwatch timer;
  timer.Start();
  gAlice->Run(nevent);
  timer.Stop();
  timer.Print();
  timer.Reset();
  timer.Start();
  gAlice->Hits2Digits("ITS");
  timer.Stop(); timer.Print(); 
  AliITSreconstruction *itsr = new AliITSreconstruction(0);
  itsr->Exec();
  delete itsr;
  
}