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 |
| --- | --- | --- | --- | --- |
| Nigel Mansell | Williams - Honda | 65.0 | 1:19:11.780 | 2.0 |
| Nelson Piquet | Williams - Honda | 65.0 | + 1.918 | 1.0 |
| Ayrton Senna | Lotus - Honda | 64.0 | + 1 Lap | 3.0 |
| Satoru Nakajima | Lotus - Honda | 63.0 | + 2 Laps | 12.0 |
| Derek Warwick | Arrows - Megatron | 63.0 | + 2 Laps | 13.0 |
| Teo Fabi | Benetton - Ford | 63.0 | + 2 Laps | 6.0 |
| Thierry Boutsen | Benetton - Ford | 62.0 | + 3 Laps | 5.0 |
| Jonathan Palmer | Tyrrell - Ford | 60.0 | + 5 Laps | 23.0 |
| Pascal Fabre | AGS - Ford | 59.0 | + 6 Laps | 25.0 |
| Philippe Streiff | Tyrrell - Ford | 57.0 | Engine | 22.0 |
| Martin Brundle | Zakspeed | 54.0 | Not Classified | 17.0 |
| Alain Prost | McLaren - TAG | 53.0 | Engine | 4.0 |
| Michele Alboreto | Ferrari | 52.0 | Suspension | 7.0 |
| Eddie Cheever | Arrows - Megatron | 45.0 | Engine | 14.0 |
| Adrián Campos | Minardi - Motori Moderni | 34.0 | Fuel System | 19.0 |
| Alex Caffi | Osella - Alfa Romeo | 32.0 | Engine | 20.0 |
| Christian Danner | Zakspeed | 32.0 | Gearbox | 18.0 |
| Riccardo Patrese | Brabham - BMW | 28.0 | Turbo | 11.0 |
| Stefan Johansson | McLaren - TAG | 18.0 | Engine | 10.0 |
| Alessandro Nannini | Minardi - Motori Moderni | 10.0 | Engine | 15.0 |
| Andrea de Cesaris | Brabham - BMW | 8.0 | Turbo | 9.0 |
| Gerhard Berger | Ferrari | 7.0 | Accident | 8.0 |
| Philippe Alliot | Lola - Ford | 7.0 | Gearbox | 21.0 |
| René Arnoux | Ligier - Megatron | 3.0 | Electrical | 16.0 |
| Ivan Capelli | March - Ford | 3.0 | Accident | 24.0 |
| Piercarlo Ghinzani | Ligier - Megatron | 0.0 | Excluded | 19.0 |
Question:
What is the sum of laps for Derek Warwick?
Answer:
63.0