CCN(CC)c1ncnc2c1ncn2[C@@H]1O[C@H](COP(=O)([O-])OP(=O)([O-])C(Br)(Br)P(=O)([O-])O)[C@@H](O)[C@@H]1O.[Na+].[Na+].[Na+]
All atoms other than hydrogen are referred to be heavy atoms. How many heavy atoms are there in the molecule?