of enactment of this Act, the maximum monthly benefit amount and the minimum monthly benefit amount shall be $4,000 and $580, respectively. (B) Wage indexing For individuals who initially become eligible for family and medical leave insurance benefits in any calendar year after such first full calendar year the maximum benefit amount and the minimum benefit amount shall be, respectively, the product of the corresponding amount determined with respect to the first calendar year under subparagraph (A) and the quotient obtained by dividing— (i) the national average wage index for the second calendar year preceding the calendar year for which the determination is made, by (ii) the national average wage index for the second calendar year preceding the first full calendar year after the date of enactment of this Act. (4) Reduction in benefit amount on account of receipt of certain benefits A benefit under this section for a month shall be reduced by the amount, if any, in certain benefits (as determined under regulations issued by the Commissioner) as may be otherwise received by an individual. For purposes of the preceding sentence, certain benefits include— (A) periodic benefits on account of such individual’s total or partial disability under a workmen’s compensation law or plan of the United States or a State