S=C(NCCCN(Cc1ccc(Cl)cc1)c1ccc(-c2ccccc2)cn1)NCCCN(Cc1ccc(Cl)cc1)c1ccc(-c2ccccc2)cn1
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?