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 | 36.0 | 3:03:46.3 | 1.0 |
| Nino Farina | Ferrari | 36.0 | +1:55.2 | 2.0 |
| Robert Manzon | Gordini | 36.0 | +4:28.4 | 4.0 |
| Mike Hawthorn | Cooper - Bristol | 35.0 | +1 lap | 6.0 |
| Paul Frère | HWM - Alta | 34.0 | +2 laps | 8.0 |
| Alan Brown | Cooper - Bristol | 34.0 | +2 laps | 9.0 |
| Charles de Tornaco | Ferrari | 33.0 | +3 laps | 13.0 |
| Johnny Claes | Gordini | 33.0 | +3 laps | 19.0 |
| Eric Brandon | Cooper - Bristol | 33.0 | +3 laps | 12.0 |
| B. Bira | Simca - Gordini - Gordini | 32.0 | +4 laps | 18.0 |
| Lance Macklin | HWM - Alta | 32.0 | +4 laps | 14.0 |
| Roger Laurent | HWM - Alta | 32.0 | +4 laps | 20.0 |
| Arthur Legat | Veritas | 31.0 | +5 laps | 21.0 |
| Robert O'Brien | Simca - Gordini - Gordini | 30.0 | +6 laps | 22.0 |
| Tony Gaze | HWM - Alta | 30.0 | +6 laps | 16.0 |
| Robin Montgomerie-Charrington | Aston Butterworth | 17.0 | Engine | 15.0 |
| Piero Taruffi | Ferrari | 13.0 | Accident | 3.0 |
| Jean Behra | Gordini | 13.0 | Accident | 5.0 |
| Ken Wharton | Frazer-Nash - Bristol | 10.0 | Spun off | 7.0 |
| Louis Rosier | Ferrari | 6.0 | Transmission | 17.0 |
| Peter Collins | HWM - Alta | 3.0 | Halfshaft | 11.0 |
| Stirling Moss | ERA - Bristol | 0.0 | Engine | 10.0 |
Question:
How many laps for robin montgomerie-charrington, and a Grid smaller than 15?
Answer:
0.0