Two solids dissociate as follows
$\begin{aligned} & \mathrm{A}(\mathrm{s}) \rightleftharpoons \mathrm{B}(\mathrm{g})+\mathrm{C}(\mathrm{g}) ; \mathrm{K}_{\mathrm{P}_1}=\mathrm{x} \mathrm{atm}^2 \\ & \mathrm{D}(\mathrm{s}) \rightleftharpoons \mathrm{C}(\mathrm{g})+\mathrm{E}(\mathrm{g}) ; \mathrm{K}_{\mathrm{P}_2}=\mathrm{yatm}^2\end{aligned}$ The total pressure when both the solids dissociate simultaneously is