CREATE TABLE table_204_599 (id DECIMAL, "party" TEXT, "first duma" TEXT, "second duma" TEXT, "third duma" TEXT, "fourth duma" TEXT)

how many third duma and fourth duma for nationalists
SELECT "third duma" + "fourth duma" FROM table_204_599 WHERE "party" = 'nationalists'
SELECT "third duma" + "fourth duma" FROM "table_204_599" WHERE "party" = 'nationalists'