Poland is governed under the constitution of 1997. The president, who is the head of state, is popularly elected for a five-year term and is eligible for a second term. The prime minister, who is the head of government, is appointed by the president, as is the cabinet, with the approval of the Sejm. The bicameral National Assembly consists of a 460-seat Sejm (lower house) and a 100-seat Senate (upper house). Members of both bodies are elected for four-year terms. Administratively, Poland is divided into 16 provinces.