Moment of inertia of a disc of mass M and radius ‘R’ about any of its diameter is $\frac{{\mathrm{MR}}^2}{4}$. The moment of inertia of this disc about an axis normal to the disc and passing through a point on its edge will be, $\frac{\mathrm{x}}{2}{\mathrm{MR}}^2$ . The value of x is ________.