<Tr> <Th_colspan="3"> Sources: </Th> </Tr> <P> Since 2001, the president has earned a $400,000 annual salary, along with a $50,000 annual expense account, a $100,000 nontaxable travel account, and $19,000 for entertainment . The most recent raise in salary was approved by Congress and President Bill Clinton in 1999 and went into effect in 2001 . </P> <P> The White House in Washington, D.C. serves as the official residence of the president . Facilities that are available to the president include access to the White House staff, medical care, recreation, housekeeping, and security services . The government pays for state dinners and other official functions, but the president pays for personal, family, and guest dry cleaning and food; the high food bill often amazes new residents . Camp David, officially titled Naval Support Facility Thurmont, is a mountain - based military camp in Frederick County, Maryland, used as a country retreat and for high alert protection of the president and guests . Blair House, located next to the Eisenhower Executive Office Building at the White House Complex and Lafayette Park, is a complex of four connected townhouses exceeding 70,000 square feet (6,500 m) of floor space that serves as the president's official guest house and as a secondary residence for the president if needed . </P> <P> The primary means of long distance air travel for the president is one of two identical Boeing VC - 25 aircraft, which are extensively modified Boeing 747 airliners and are referred to as Air Force One while the president is on board (although any U.S. Air Force aircraft the president is aboard is designated as "Air Force One" for the duration of the flight). In - country trips are typically handled with just one of the two planes, while overseas trips are handled with both, one primary and one backup . The president also has access to smaller Air Force aircraft, most notably the Boeing C - 32, which are used when the president must travel to airports that cannot support a jumbo jet . Any civilian aircraft the president is aboard is designated Executive One for the flight . </P>

Which of the following is not a function of an american president