O=C1N(CN2CCOCC2)CN(CN2CCOCC2)C(=O)N1Cc1ccc(-c2ccc(CN3C(=O)N(CN4CCOCC4)CN(CN4CCOCC4)C3=O)cc2)cc1
All atoms other than hydrogen are referred to be heavy atoms. How many heavy atoms are there in the molecule?