Table schema:
CREATE TABLE table_name_17 (total VARCHAR, affiliation VARCHAR, life_peers VARCHAR, hereditary_peers VARCHAR, lords_spiritual VARCHAR)

Question: Which Total has a Hereditary peer of –, and a Lords spiritual of –, and a Life peers of 2, and an Affiliation of plaid cymru?
SQL: SELECT COUNT(total) FROM table_name_17 WHERE hereditary_peers = "–" AND lords_spiritual = "–" AND life_peers = "2" AND affiliation = "plaid cymru"