CREATE TABLE table_56315 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

What is Pedro De La Rosa's total number of Grid?
SELECT COUNT("Grid") FROM table_56315 WHERE "Driver" = 'pedro de la rosa'
SELECT COUNT("Grid") FROM "table_56315" WHERE "Driver" = 'pedro de la rosa'