CREATE TABLE table_18254 ("District" CLOB, "Incumbent" CLOB, "Party" CLOB, "First elected" FLOAT, "Result" CLOB, "Candidates" CLOB)

what is the maximum first elected with incumbent being gus yatron
SELECT MAX("First elected") FROM table_18254 WHERE "Incumbent" = 'Gus Yatron'
SELECT MAX("First elected") FROM "table_18254" WHERE "Incumbent" = 'Gus Yatron'