The space between the plates of a parallel plate capacitor of capacitance C (without any dielectric) is now filled with three dielectric slabs of…

The space between the plates of a parallel plate capacitor of capacitance C (without any dielectric) is now filled with three dielectric slabs of dielectric constants $\displaystyle K_1=2, K_2=3$ and $\displaystyle K_3=5$ (as shown in figure). If new capacitance is $\displaystyle \frac{n}{3} C$ then the value of $\displaystyle n$ is $\displaystyle \_\_\_\_$.