CREATE TABLE table_18342 ("District" TEXT, "Incumbent" TEXT, "Party" TEXT, "First elected" FLOAT, "Result" TEXT, "Candidates" TEXT)

How many incumbents are there in district Louisiana 5?
SELECT COUNT("Incumbent") FROM table_18342 WHERE "District" = 'Louisiana 5'
SELECT COUNT("Incumbent") FROM "table_18342" WHERE "District" = 'Louisiana 5'