Number of crystal systems having only 2 types of bravais lattices =...

Number of crystal systems having only $2$ types of bravais lattices $= x$ , number of crystal system having at least two interfacial angles equal $= y$ and number of crystal systems having all the three edge lengths equal $= z$ . Then find the value of $\text{x} \times \text{y} \times \text{z}\text{.}$