O=C1/C(=C\c2ccccc2)C2/C(=C\c3ccccc3)C(=O)/C(=C\c3ccccc3)C2/C1=C\c1ccccc1
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?