El Salvador is governed under the constitution of 1983. The president, who is both head of state and head of government, is popularly elected for a five-year term and may not succeed himself. The members of the 84-seat unicameral Legislative Assembly are elected for three-year terms. The principal parties are the National Republican Alliance (ARENA), the Christian Democratic party (PDC), and the Farabundo Martí National Liberation Front (FMLN). The country is divided administratively into 14 departments.