Bangladesh is a unitary state and parliamentary democracy. Direct elections in which all citizens, aged 18 or over, can vote are held every five years for the unicameral parliament known as Jatiya Sangsad. The parliamentary building is known as the Jatiyo Sangshad Bhaban and was designed by architect Louis Kahn. Currently the parliament has 345 members including 45 reserved seats for women, elected from single-member constituencies. The Prime Minister, as the head of government, forms the cabinet and runs the day-to-day affairs of state. While the Prime Minister is formally appointed by the President, he or she must be an MP who commands the confidence of the majority of parliament. The President is the head of state but mainly a ceremonial post elected by the parliament.