In orthorhombic unit cell the value of $\text{a, b}$ and $\text{c}$ are respectively $\text{4}\text{.2 Å,}\text{8}\text{.6 Å}$ and $\text{8}\text{.3 Å}$ . Given the molecular mass of the solute is $\text{155 g}$ $\mathrm{m}\mathrm{o}{\mathrm{l}}^{-1}$ and density is $\text{3}\text{.3 g/cc}$ , the number of formula units per unit cell is (Report your answer by rounding up to nearest integer)