The Mayor may, in writing filed with the Council, disapprove any ordinance or resolution within five days after its passage and if so disapproved such ordinance shall not thereafter be effective unless the Council, at its next ensuing regular meeting, shall set aside such disapproval by a three-fourths vote of all members elected to Council. The Council, however, shall not have the power to set aside the disapproval of any ordinance designed to increase the salary or compensation of officials in office as provided in Article IV, Section 1, hereof.