Consider two matrices $\mathbf{P}=\left[\begin{array}{ll}2 & 3 \\ 1 & 4\end{array}\right]$ and $\mathbf{Q}=\left[\begin{array}{ll}5 & 4 \\ 0 & 2\end{array}\right]$. If $\mathbf{R}=(\mathbf{P Q})^{\mathrm{T}}$ then $\operatorname{det} \mathbf{R}$ is (in integer).
