Congress has two chambers. The House of Representatives has 304 seats , of which 80% are contested in single seat electoral districts and 20% are allotted to party-lists according to a modified Hare quota with remainders disregarded and a three-seat cap. These party list seats are only accessible to marginalized and under-represented groups and parties, local parties, and sectoral wings of major parties that represent the marginalized. The Constitution of the Philippines allows the House of Representatives to have more than 250 members by statute without a need for a constitutional amendment. The Senate has 24 members who are elected on a nationwide at-large basis; they do not represent any geographical district. Half of the Senate is renewed every three years.