elections under applicable Federal and local law for representation in the Senate and the House of Representatives in accordance with the following: (1) In the first election of Senators, the two senatorial offices shall be separately identified and designated, and no person may be a candidate for both offices. Nothing in this section shall impair the privilege of the Senate to determine the class and term to which each of the Senators-elect shall be assigned. (2) In the first election of a Representative, Puerto Rico shall be entitled to one Representative upon its admission into the Union as a State. In the next election for the United States House of Representatives, Puerto Rico shall be entitled to the same number of Representatives as the State whose most recent Census population was closest to, but less than, that of Puerto Rico, and such Representatives shall be in addition to the membership of the House of Representatives as now prescribed by law: Provided , that any increase in the membership shall not operate to either increase or decrease the permanent membership of the House of Representatives as prescribed in the Act of August 8, 1911 (37 Stat. 13), nor shall such temporary increase affect the basis of apportionment established by the Act of November 15, 1941 (55 Stat. 761