The longest wavelength of light that can be used for the ionisation of lithium atom (Li) in its ground state is x $\times$ 10^$-$8 m. The value of x is ___________. (Nearest Integer).

(Given : Energy of the electron in the first shell of the hydrogen atom is $-$2.2 $\times$ 10^$-$18 J ; h = 6.63 $\times$ 10^$-$34 Js and c = 3 $\times$ 10⁸ ms^$-$1)