If the binding energy of ground state electron in a hydrogen atom is 13.6 eV, then, the energy required to remove the electron from the second…

If the binding energy of ground state electron in a hydrogen atom is $\displaystyle 13.6$ eV , then, the energy required to remove the electron from the second excited state of $\displaystyle \mathrm{Li}^{2+}$ will be : $\displaystyle x \times 10^{-1} \mathrm{eV}$. The value of $\displaystyle x$ is $\displaystyle \_\_\_\_$.