The Secretary of the Treasury is authorized to pay the balance of the subscription of the United States to the Fund not provided for in subsection (a) and to pay the subscription of the United States to the Bank from time to time when payments are required to be made to the Bank. For the purpose of making these payments, the Secretary of the Treasury is authorized to use as a public-debt transaction $8,675,000,000 of the proceeds of any securities hereafter issued under chapter 31 of title 31, and the purposes for which securities may be issued under that chapter are extended to include such purpose. Payment under this paragraph of the subscription of the United States to the Fund or the Bank and repayments thereof shall be treated as public-debt transactions of the United States.

For the purpose of keeping to a minimum the cost to the United States of participation in the Fund and the Bank, the Secretary of the Treasury, after paying the subscription of the United States to the Fund, and any part of the subscription of the United States to the Bank required to be made under article II, section 7(i), of the Articles of Agreement of the Bank, is authorized and directed to issue special notes of the United States from time to time at par and to deliver such notes to the Fund and the Bank in exchange for dollars to the e