In chemistry, a rotatable bond refers to a type of bond that is not part of a ring structure, and is attached to an atom which is not a terminal hydrogen atom. Amide C-N bonds are not considered as rotatable bonds due to their high barrier to rotation. It is worth noting that in order for a bond to be rotatable, the two atoms connected by it must be able to rotate freely around the bond axis without any significant energy barrier. This is an important concept in the design and optimization of molecules for drug discovery and other applications.What is the count of bonds in the molecule that can rotate?