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 ______.
