What is the flux through a cube of side 'a' if a point charge

What is the flux through a cube of side 'a' if a point charge of q is at one of its corner :

Eight identical cubes are required to arrange so that this charge is at centre of the cube formed so flux.

φ =	q
	8ε₀

	2q
	e₀

	q
	8e₀

	q
	e₀

	q
	2e₀