Electrostatics: JEE Main 2026 Physics question

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 $K_1=2$, $K_2=3$ and $K_3=5$ (as shown in figure). If new capacitance is $\frac{n}{3}C$ then the value of $n$ is ______.