A teacher who is the Association President shall be given an additional fifteen (15) days leave at substitute costs which shall be assumed by the Society. These additional days are not included in the maximum outlined in 17.04. The Association President shall be given an option to use leave either, under Article 17.02 or 17.06, in addition to leave under Article 17.01. Leave beyond this amount may be granted by the Board provided the cost of the teacher’s salary (1/200th deduction) is assumed by the Society.