Cc1c([N+](=O)[O-])cc([N+](=O)[O-])c(-c2c([N+](=O)[O-])cc([N+](=O)[O-])c(C)c2[N+](=O)[O-])c1[N+](=O)[O-]
All atoms other than hydrogen are referred to be heavy atoms. How many heavy atoms are there in the molecule?