Except as provided in paragraph (2), if an individual breaches his written contract by failing (for any reason not specified in subsection (a) or
section 254p(d) of this title) to begin such individual’s service obligation under section 254
l of this title in accordance with section 254m or 254n of this title, to complete such service obligation, or to complete a required residency as specified in section 254
l(f)(1)(B)(iv) of this title, the United States shall be entitled to recover from the individual an amount determined in accordance with the formula