CREATE TABLE table_name_17 (laps INTEGER, year VARCHAR(255), co_drivers VARCHAR(255), class VARCHAR(255))
Name the sum of Laps for co-drivers of oliver gavin jan magnussen and class of gts with year less than 2004
    
SQL: SELECT SUM(laps) FROM table_name_17 WHERE co_drivers = "oliver gavin jan magnussen" AND class = "gts" AND year < 2004