An atomic substance A of molar mass $12 \mathrm{~g} \mathrm{~mol}^{-1}$ has a cubic crystal structure with edge length of $300 ~\mathrm{pm}$. The no. of atoms present in one unit cell of $\mathrm{A}$ is ____________. (Nearest integer)

Given the density of $\mathrm{A}$ is $3.0 \mathrm{~g} \mathrm{~mL}^{-1}$ and $\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-1}$