{

  hx      = new TH1F("hx","1-dim",100,-4,4);
  hxy     = new TH2F("hxy","2-dim",40,-4,4,40,-4,4);
  hxyz    = new TH3F("hxyz","3-dim",20,-4,4,20,-4,4,20,-4,4);

  gRandom->SetSeed();

  float x, y, z;

  for (int i=0; i<100; i++) {

     gRandom->Rannor(x,y);
     z = x;

     float random = gRandom->Rndm(1);

     hx->Fill(x);
     hxy->Fill(x,y);
     hxyz->Fill(x,y,z);

  }

  // hx->Draw();
     hxy->Draw();
  // hxyz->Draw();

}