Please read the following table in Markdown format and then answer the question according to the table. Table cells in one row are seperated by '|', and different rows are seperated by '
'.

Table:
| Driver | Constructor | Laps | Time/Retired | Grid |
| --- | --- | --- | --- | --- |
| Bruce McLaren | McLaren - Ford | 28.0 | 1:40:02.1 | 6.0 |
| Pedro Rodríguez | BRM | 28.0 | + 12.1 | 8.0 |
| Jacky Ickx | Ferrari | 28.0 | + 39.6 | 3.0 |
| Jackie Stewart | Matra - Ford | 27.0 | Out of fuel | 2.0 |
| Jackie Oliver | Lotus - Ford | 26.0 | Transmission | 15.0 |
| Lucien Bianchi | Cooper - BRM | 26.0 | + 2 Laps | 12.0 |
| Jo Siffert | Lotus - Ford | 25.0 | Oil Pressure | 9.0 |
| Jean-Pierre Beltoise | Matra | 25.0 | + 3 Laps | 13.0 |
| Piers Courage | BRM | 22.0 | Engine | 7.0 |
| Denny Hulme | McLaren - Ford | 18.0 | Halfshaft | 5.0 |
| John Surtees | Honda | 11.0 | Suspension | 4.0 |
| Chris Amon | Ferrari | 8.0 | Radiator | 1.0 |
| Brian Redman | Cooper - BRM | 6.0 | Spun Off | 11.0 |
| Richard Attwood | BRM | 6.0 | Oil Pipe | 18.0 |
| Jack Brabham | Brabham - Repco | 6.0 | Throttle | 10.0 |
| Graham Hill | Lotus - Ford | 5.0 | Halfshaft | 14.0 |
| Jochen Rindt | Brabham - Repco | 5.0 | Engine | 17.0 |
| Jo Bonnier | McLaren - BRM | 1.0 | Wheel | 16.0 |
Question:
What is the largest Grid with a Driver of piers courage?
Answer:
7.0