; and (B) obtain from the Office of Management and Budget updates to the estimate of the spending ceiling and adjustments, as appropriate. 443. Use of ceiling (a) By Congress When considering legislation, the Senate and the House of Representatives shall adhere to the spending ceiling, as determined by the Director of the Congressional Budget Office under section 442(c)(1) (including any adjustments under section 444 or 445(c)). (b) By executive branch When considering proposals with fiscal implications, the President shall adhere to the spending ceiling, as determined by the Director of the Office of Management and Budget under section 442(c)(2) (including any adjustments under sections 444 or 445(c)). 444. Adjusting the spending ceiling When adopting a concurrent resolution on the budget (including a concurrent resolution on the budget described in section 304), Congress may adjust the spending ceiling as determined under section 442(c)(1), and when enacting a supplemental appropriations Act, Congress may adjust the spending ceiling as determined under section 442(c)(2), commensurate with— (1) appropriations for an emergency, as defined in section 250(c) of the Balanced Budget and Emergency Deficit Control Act of 1985 ( 2 U.S.C. 900(c) ); (2) a revision in the estimate of the gross domestic product of the United States for any year to which section 441(4)(B) applies; (3) cyclical variations due to the difference between the actual and potential amount of the gross domestic product of the United States; (4) timing shifts of expenditures or revenues due; or (5) enacted laws that result in a change in revenue. 445. Emergency account adjustments (a) Establishment of emergency account The Director of the Congressional Budget Office and the Director of the Office of Management and Budget shall each maintain an emergency account. (b) Computation (1) In general The amount of the emergency account shall be— (A) increased by the amount of the adjustment made under section 444(1)