O=C1c2cc(Br)ccc2N(Cc2ccc(Br)cc2)S(=O)(=O)C1c1cc(Cl)c(Cl)cc1[N+](=O)[O-]
Heavy atom refers to any atom that is not hydrogen. The heavy atoms in molecules are carbon, oxygen, nitrogen, and sulfur. How many heavy atoms are in the molecule?