Electromagnetic Induction and Alternating Currents: JEE Main 2020 Physics question

In a series LR circuit, power of 400W is dissipated from a source of 250 V, 50 Hz. The power factor of the circuit is 0.8. In order to bring the power factor to unity, a capacitor of value C is added in series to the L and R. Taking the value of C as $\left( {{n \over {3\pi }}} \right)$ $\mu$F, then value of n is __________.