Panama is a representative democracy with three branches of government: executive and legislative branches elected by direct vote for 5-year terms, and an independently appointed judiciary. The executive branch includes a president and two vice presidents. The legislative branch consists of a 72-member unicameral Legislative Assembly. The judicial branch is organized under a nine-member Supreme Court and includes all tribunals and municipal courts. An autonomous Electoral Tribunal supervises voter registration, the election process, and the activities of political parties. Everyone over the age of 18 is required to vote, although those who fail to do so are not penalized.