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 |
| --- | --- | --- | --- | --- |
| Alberto Ascari | Ferrari | 80.0 | 2:42:39.3 | 3.0 |
| José Froilán González | Ferrari | 80.0 | +24.6 | 4.0 |
| Felice Bonetto Nino Farina | Alfa Romeo | 79.0 | +1 lap | 7.0 |
| Luigi Villoresi | Ferrari | 79.0 | +1 lap | 5.0 |
| Piero Taruffi | Ferrari | 78.0 | +2 laps | 6.0 |
| André Simon | Simca-Gordini | 74.0 | +6 laps | 11.0 |
| Louis Rosier | Talbot-Lago - Talbot | 73.0 | +7 laps | 15.0 |
| Yves Giraud-Cabantous | Talbot-Lago - Talbot | 72.0 | +8 laps | 14.0 |
| Franco Rol | OSCA | 67.0 | +13 laps | 18.0 |
| Juan Manuel Fangio | Alfa Romeo | 39.0 | Engine | 1.0 |
| Maurice Trintignant | Simca-Gordini | 29.0 | Engine | 12.0 |
| Robert Manzon | Simca-Gordini | 29.0 | Engine | 13.0 |
| Louis Chiron | Talbot-Lago - Talbot | 23.0 | Ignition | 17.0 |
| Pierre Levegh | Talbot-Lago - Talbot | 9.0 | Engine | 20.0 |
| Jacques Swaters | Talbot-Lago - Talbot | 7.0 | Overheating | 22.0 |
| Nino Farina | Alfa Romeo | 6.0 | Engine | 2.0 |
| Johnny Claes | Talbot-Lago - Talbot | 4.0 | Oil pump | 21.0 |
| Toulo de Graffenried | Alfa Romeo | 1.0 | Compressor | 9.0 |
| Peter Whitehead | Ferrari | 1.0 | Magneto | 19.0 |
| Chico Landi | Ferrari | 0.0 | Transmission | 16.0 |
| Reg Parnell | BRM | 0.0 | Non Starter | 8.0 |
| Ken Richardson | BRM | 0.0 | Non Starter | 10.0 |
Question:
I want the lowest laps that have a grid of 12
Answer:
29.0