Turkey is a parliamentary democracy governed under the constitution of 1982 as amended. The president, who is the head of state, is elected by the legislature for a single seven-year term. The government is headed by the prime minister, who is appointed by the president. The unicameral legislature consists of the 550-seat Grand National Assembly, whose members are elected by popular vote to serve five-year terms; a party must receive at least 10% of the vote to be seated in the assembly. Administratively, Turkey is divided into 81 provinces.