CREATE TABLE table_11777 ("Driver" TEXT, "Constructor" TEXT, "Laps" FLOAT, "Time/Retired" TEXT, "Grid" FLOAT)

Name the sum of Laps for lance reventlow with grid more than 16
SELECT SUM("Laps") FROM table_11777 WHERE "Driver" = 'lance reventlow' AND "Grid" > '16'
SELECT SUM("Laps") FROM "table_11777" WHERE "Driver" = 'lance reventlow' AND "Grid" > '16'