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 |
| --- | --- | --- | --- | --- |
| Ayrton Senna | Lotus - Renault | 72.0 | 1:48:47.735 | 1.0 |
| Nigel Mansell | Williams - Honda | 72.0 | + 0.014 | 3.0 |
| Alain Prost | McLaren - TAG | 72.0 | + 21.552 | 4.0 |
| Keke Rosberg | McLaren - TAG | 71.0 | + 1 Lap | 5.0 |
| Teo Fabi | Benetton - BMW | 71.0 | + 1 Lap | 9.0 |
| Gerhard Berger | Benetton - BMW | 71.0 | + 1 Lap | 7.0 |
| Thierry Boutsen | Arrows - BMW | 68.0 | + 4 Laps | 19.0 |
| Patrick Tambay | Lola - Hart | 66.0 | + 6 Laps | 18.0 |
| Johnny Dumfries | Lotus - Renault | 52.0 | Gearbox | 10.0 |
| Martin Brundle | Tyrrell - Renault | 41.0 | Engine | 12.0 |
| Jacques Laffite | Ligier - Renault | 40.0 | Halfshaft | 8.0 |
| Marc Surer | Arrows - BMW | 39.0 | Fuel System | 22.0 |
| Nelson Piquet | Williams - Honda | 39.0 | Engine | 2.0 |
| Elio de Angelis | Brabham - BMW | 29.0 | Gearbox | 15.0 |
| René Arnoux | Ligier - Renault | 29.0 | Half Shaft | 6.0 |
| Michele Alboreto | Ferrari | 22.0 | Wheel Bearing | 13.0 |
| Philippe Streiff | Tyrrell - Renault | 22.0 | Engine | 20.0 |
| Christian Danner | Osella - Alfa Romeo | 14.0 | Engine | 23.0 |
| Stefan Johansson | Ferrari | 11.0 | Brakes | 11.0 |
| Piercarlo Ghinzani | Osella - Alfa Romeo | 10.0 | Engine | 21.0 |
| Riccardo Patrese | Brabham - BMW | 8.0 | Gearbox | 14.0 |
| Andrea de Cesaris | Minardi - Motori Moderni | 1.0 | Differential | 24.0 |
| Jonathan Palmer | Zakspeed | 0.0 | Collision | 16.0 |
| Alan Jones | Lola - Hart | 0.0 | Collision | 17.0 |
| Alessandro Nannini | Minardi - Motori Moderni | 0.0 | Differential | 25.0 |
Question:
What is the grid total for alain prost with over 14 laps?
Answer:
4.0