Find the number of $\sigma$ and $\pi$ bonds present in Marshall's acid?

Marshall's acid is another name for peroxydisulfuric acid. 

Structure:

It is an odorless solid that is colorless and soluble in water. Peroxodisulfuric acid contains the following number of sigma or pi-bonds:

Peroxodisulfuric acid therefore contains 4$\pi$ bonds and 11$\sigma$ bonds.