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 |
| --- | --- | --- | --- | --- |
| Nino Farina | Alfa Romeo | 80.0 | 2:51:17.4 | 3.0 |
| Dorino Serafini Alberto Ascari | Ferrari | 80.0 | + 1:18.6 | 6.0 |
| Luigi Fagioli | Alfa Romeo | 80.0 | + 1:35.6 | 5.0 |
| Louis Rosier | Talbot-Lago - Talbot | 75.0 | + 5 Laps | 13.0 |
| Philippe Étancelin | Talbot-Lago - Talbot | 75.0 | + 5 Laps | 16.0 |
| Toulo de Graffenried | Maserati | 72.0 | + 8 Laps | 17.0 |
| Peter Whitehead | Ferrari | 72.0 | + 8 Laps | 18.0 |
| David Murray | Maserati | 56.0 | Gearbox | 24.0 |
| Cuth Harrison | ERA | 51.0 | Radiator | 21.0 |
| Raymond Sommer | Talbot-Lago - Talbot | 48.0 | Gearbox | 8.0 |
| Guy Mairesse | Talbot-Lago - Talbot | 42.0 | Oil Pipe | 11.0 |
| Franco Rol | Maserati | 39.0 | Retirement | 9.0 |
| Piero Taruffi Juan Manuel Fangio | Alfa Romeo | 34.0 | Engine | 7.0 |
| Pierre Levegh | Talbot-Lago - Talbot | 29.0 | Gearbox | 20.0 |
| Juan Manuel Fangio | Alfa Romeo | 23.0 | Gearbox | 1.0 |
| Johnny Claes | Talbot-Lago - Talbot | 22.0 | Overheating | 22.0 |
| Alberto Ascari | Ferrari | 21.0 | Engine | 2.0 |
| Clemente Biondetti | Ferrari - Jaguar | 17.0 | Engine | 25.0 |
| Henri Louveau | Talbot-Lago - Talbot | 16.0 | Brakes | 16.0 |
| Franco Comotti | Maserati - Milano | 15.0 | Retirement | 26.0 |
| Maurice Trintignant | Simca - Gordini | 13.0 | Water Pipe | 12.0 |
| Louis Chiron | Maserati | 13.0 | Oil Pressure | 19.0 |
| Consalvo Sanesi | Alfa Romeo | 11.0 | Engine | 4.0 |
| Robert Manzon | Simca - Gordini | 7.0 | Transmission | 10.0 |
| Prince Bira | Maserati | 1.0 | Engine | 15.0 |
| Paul Pietsch | Maserati | 0.0 | Engine | 27.0 |
| Felice Bonetto | Milano -Speluzzi | 0.0 | Non Starter | 23.0 |
Question:
What was the smallest grid for Prince bira?
Answer:
15.0