The Constitution of the Democratic Socialist Republic of Sri Lanka discharging the powers, duties and functions of the office of President shall forthwith cease to exercise, perform and discharge such powers, duties and functions. During the period intervening between the date of such determination and the assumption of office by the new President, the Prime Minister shall act in the office of President and shall appoint one of the other Ministers of the Cabinet to act in the office of the Prime Minister: Provided that if the office of Prime Minister be then vacant or the Prime Minister is unable to act, the Speaker shall act in the office of the President. (3) For the purposes of Article 30(2) and notwithstanding the provisions of Article 31(4), the term of office of the new President shall be deemed to have commenced on the date on which the term of office of the person whose election was determined to have been void or undue would, but for such determination, have commenced. (4) The exercise, performance and discharge by any person of the powers, duties and functions of the office of President shall not be invalid by reason only of the fact that the Supreme Court subsequently determines that the election of such person as President was void or undue. (5) The provisions of this Article shall apply notwithstanding anything to the contrary in Article 40. 40. (1) (a) If the office of President shall become vacant prior to the expiration of his term of office, Parliament shall elect as President one of its Members who is qualified to be elected to the office of President. Any person so succeeding to the office of President shall hold office only for the unexpired period of the term of office of the President vacating office. Vacation of office by President and election of succeeding President 37