Table schema:
CREATE TABLE table_name_30 (laps INTEGER, driver VARCHAR, grid VARCHAR, time_retired VARCHAR)

Question: What is the largest number of laps with a Grid larger than 14, a Time/Retired of + 2 laps, and a Driver of helmut marko?
SQL: SELECT MAX(laps) FROM table_name_30 WHERE grid > 14 AND time_retired = "+ 2 laps" AND driver = "helmut marko"