{
gROOT->Clear();
gROOT->Reset();

TChain *Achain = new TChain("h1"); //chain of files
char filenameA[120];               //filename char
int nfiles = 293;                  //Max Number of files

for (int i=1; i<=nfiles; i++){
  if (i<1000) sprintf(filenameA,"/disk/usr4/ethrane/upmu3ET/tanaka/rck_Hon03_%i.sube.umred.upmu3.hbk.root",i);
  if (i<100)  sprintf(filenameA,"/disk/usr4/ethrane/upmu3ET/tanaka/rck_Hon03_0%i.sube.umred.upmu3.hbk.root",i);
  if (i<10)   sprintf(filenameA,"/disk/usr4/ethrane/upmu3ET/tanaka/rck_Hon03_00%i.sube.umred.upmu3.hbk.root",i);
  ifstream data(filenameA);
  if(data.fail()){cout << filenameA << " does not exist." << endl;}
  if(!data.fail()){cout << filenameA << " added." << endl;}
  if(!data.fail()){Achain->Add(filenameA);}
  data.close();
}

Achain->Merge("./tanaka.root");    //merged output file
}