The most important governmental institutions in the Republic of Lithuania are situated in Vilnius, the capital of Lithuania and the largest city in the country. The capitals of the state of Lithuania used to be Kernave, Trakai and Kaunas. Lithuania is a multiparty, parliamentary democracy. The Constitution is the supreme law of the country. In Lithuania, State power shall be executed by the Seimas (the Parliament), the President of the Republic and the Government. The head of the state is elected directly for five years. A Lithuanian citizen by origin, who has lived in Lithuania for not less than the last three years, if he has reached the age of not less than 40 prior to the election day, and if he may be elected a Member of the Seimas (satisfies all requirements raised for a member of the Seimas), may be elected the President of the Republic. The same person may not be elected the President of the Republic for more than two consecutive terms. The legislative body of the Republic of Lithuania – the Seimas – has 141 members elected for a four-year term on the basis of direct election. The sittings of the Seimas shall be presided over by the Speaker of the Seimas or his Deputy. Every year, the Seimas convene for two regular sessions – spring and autumn. The spring session commences on the 10th of March and ends on 30th of June. The autumn session commences on the 10th of September and ends on 23rd of December. The first sitting of the newly-elected Seimas must be held within 16 days of the Seimas election. Usually The President of the Republic convenes the first sitting of the newly-elected Seimas. The first sitting of the Seimas after the elections is opened by the eldest Member of the Seimas. The structure and working procedure of the Seimas is established in the Statute of the Seimas. The Government of the Republic of Lithuania is lead by the Prime Minister, who with the assent of the Seimas, be appointed by the President of the Republic. The Ministers shall be appointed by the President of the Republic upon the submission of the Prime Minister. All citizens of the Republic of Lithuania who are 18 years and over are entitled to universal suffrage. Any citizen of the Republic of Lithuania who is not younger than 25 years of age may be elected a Member of the Seimas.