The healthcare provider changes a patient’s prescription of warfarin from 5.0 mg to 7.5 mg PO for thromboembolic unit. The medication available on the unit is 2.5 mg per tablet and the patient already received two tablets. How many additional tablets should the Practical Nurse (PN) administer to complete the newly prescribed dose? (Enter the numerical value only. If rounding is required, round to the whole number.)