O=c1cc(N2CCN(c3ccccc3F)CC2)[nH]c(=O)n1-c1ccc(Br)cc1
A rotatable bond is defined as any single non-ring bond, attached to a non-terminal, non-hydrogen atom. Amide C-N bonds are not counted because of their high barrier to rotation.  How many rotatable bonds does the molecule have?