CREATE TABLE table_18501 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

how many first elected with incumbent being william c. lantaff
SELECT COUNT("First elected") FROM table_18501 WHERE "Incumbent" = 'William C. Lantaff'
SELECT COUNT("First elected") FROM "table_18501" WHERE "Incumbent" = 'William C. Lantaff'