CREATE TABLE table_46789 ("Rider" TEXT, "Bike" TEXT, "Laps" FLOAT, "Time" TEXT, "Grid" FLOAT)

How many grids did Shinichi Nakatomi ride in?
SELECT SUM("Grid") FROM table_46789 WHERE "Rider" = 'shinichi nakatomi'
SELECT SUM("Grid") FROM "table_46789" WHERE "Rider" = 'shinichi nakatomi'