A rigid-jointed portal frame, shown in the figure, consists of beam and columns of equal length $L$. The frame has a fixed support at one end and a roller support at the other end. The frame is subjected to a uniformly distributed load $w$ and a lateral load $P$ as shown in the figure. The plastic moment capacity of the beam and column sections is $M_{p}$. Consider a combined beam-column mechanism for plastic collapse. By applying the virtual work equation corresponding to the combined plastic collapse mechanism, $M_{p}$ is expressed as
\[
M_{p}=C_{1} P L+C_{2} w L^{2}
\]
where $C_{1}$ and $C_{2}$ are constants.
The value of $\left(C_{1} / C_{2}\right)$ is $\_\_\_\_$ (in integer).
