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 $$K_{1}=2,K_{2}=3\text{ and } K_{3}=5$$ (as shown in figtue). lf new capacitance is $$\frac{n}{3}C$$ then the value of n is_____.