CREATE TABLE table_36971 ("Date" TEXT, "Tournament" TEXT, "Location" TEXT, "Winner" TEXT, "Score" TEXT, "1st prize  (  $  ) " FLOAT)

What is the total number of first prizes in USD for the Canadian Open?
SELECT SUM("1st prize ( $ )") FROM table_36971 WHERE "Tournament" = 'canadian open'
SELECT SUM("1st prize ( $ )") FROM "table_36971" WHERE "Tournament" = 'canadian open'