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 |
| --- | --- | --- | --- | --- |
| Alain Prost | McLaren - TAG | 71.0 | 1:37:21.468 | 1.0 |
| Niki Lauda | McLaren - TAG | 71.0 | + 10.283 | 6.0 |
| Nigel Mansell | Lotus - Renault | 71.0 | + 1:19.544 | 12.0 |
| Elio de Angelis | Lotus - Renault | 70.0 | + 1 Lap | 3.0 |
| Teo Fabi | Brabham - BMW | 70.0 | + 1 Lap | 10.0 |
| Patrick Tambay | Renault | 70.0 | + 1 Lap | 5.0 |
| François Hesnault | Ligier - Renault | 69.0 | + 2 laps | 20.0 |
| Keke Rosberg | Williams - Honda | 68.0 | Out of fuel | 7.0 |
| Jonathan Palmer | RAM - Hart | 67.0 | + 4 Laps | 22.0 |
| Philippe Alliot | RAM - Hart | 67.0 | + 4 Laps | 26.0 |
| René Arnoux | Ferrari | 66.0 | Electrical | 15.0 |
| Jo Gartner | Osella - Alfa Romeo | 66.0 | + 5 Laps | 23.0 |
| Eddie Cheever | Alfa Romeo | 65.0 | Out of Fuel | 17.0 |
| Stefan Bellof | Tyrrell - Ford | 69.0 | Disqualified | 24.0 |
| Stefan Johansson | Tyrrell - Ford | 69.0 | Disqualified | 25.0 |
| Thierry Boutsen | Arrows - BMW | 59.0 | Accident | 11.0 |
| Huub Rothengatter | Spirit - Hart | 53.0 | Throttle | 27.0 |
| Riccardo Patrese | Alfa Romeo | 51.0 | Engine | 18.0 |
| Andrea de Cesaris | Ligier - Renault | 31.0 | Engine | 14.0 |
| Jacques Laffite | Williams - Honda | 23.0 | Engine | 8.0 |
| Derek Warwick | Renault | 23.0 | Spun Off | 4.0 |
| Manfred Winkelhock | ATS - BMW | 22.0 | Spun Off | 16.0 |
| Ayrton Senna | Toleman - Hart | 19.0 | Engine | 13.0 |
| Marc Surer | Arrows - BMW | 17.0 | Wheel | 19.0 |
| Nelson Piquet | Brabham - BMW | 10.0 | Oil Pressure | 2.0 |
| Piercarlo Ghinzani | Osella - Alfa Romeo | 8.0 | Fuel Pump | 21.0 |
| Michele Alboreto | Ferrari | 7.0 | Engine | 9.0 |
Question:
What is the lowest grid that has over 67 laps with stefan bellof driving?
Answer:
24.0