Retirement of directors by rotation

Dear all

Please advice me with this

Theres an unlisted public co. which has 9 directors, of which 1 is MD, 3 are WTD's and the remaining 5 are additional independent directors who wil be regularised in the agm.in the above sceneraio what wil be d no. of directors liable to retire by rotation, where nthng expressly has been specified in the AOA and resolutions appointing the WTD's and the MD.

Regards

Anshu