user
Instruction
Answer the question based on the provided table.


Table
Table Title: 1971 Monaco Grand Prix
Table Content:
| Pos | No | Driver | Constructor | Laps | Time/Retired | Grid | Points |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 1 | 11 | Jackie Stewart | Tyrrell-Ford | 80 | 1:52:21.3 | 1 | 9 |
| 2 | 17 | Ronnie Peterson | March-Ford | 80 | + 25.6 | 6 | 6 |
| 3 | 4 | Jacky Ickx | Ferrari | 80 | + 53.3 | 2 | 4 |
| 4 | 9 | Denny Hulme | McLaren-Ford | 80 | + 1:06.7 | 8 | 3 |
| 5 | 1 | Emerson Fittipaldi | Lotus-Ford | 79 | + 1 Lap | 17 | 2 |
| 6 | 24 | Rolf Stommelen | Surtees-Ford | 79 | + 1 Lap | 16 | 1 |
| 7 | 22 | John Surtees | Surtees-Ford | 79 | + 1 Lap | 10 |  |
| 8 | 27 | Henri Pescarolo | March-Ford | 77 | + 3 Laps | 13 |  |
| 9 | 15 | Pedro Rodríguez | BRM | 76 | + 4 Laps | 5 |  |
| 10 | 8 | Tim Schenken | Brabham-Ford | 76 | + 4 Laps | 18 |  |
| Ret | 14 | Jo Siffert | BRM | 58 | Oil Pipe | 3 |  |
| Ret | 21 | Jean-Pierre Beltoise | Matra | 47 | Differential | 7 |  |
| Ret | 20 | Chris Amon | Matra | 45 | Differential | 4 |  |
| Ret | 5 | Clay Regazzoni | Ferrari | 24 | Accident | 11 |  |
| Ret | 10 | Peter Gethin | McLaren-Ford | 22 | Accident | 14 |  |
| Ret | 2 | Reine Wisell | Lotus-Ford | 21 | Wheel bearing | 12 |  |
| Ret | 12 | François Cevert | Tyrrell-Ford | 5 | Accident | 15 |  |
| Ret | 7 | Graham Hill | Brabham-Ford | 1 | Accident | 9 |  |
| DNQ | 16 | Howden Ganley | BRM |  |  |  |  |
| DNQ | 6 | Mario Andretti | Ferrari |  |  |  |  |
| DNQ | 19 | Nanni Galli* | March-Alfa-Romeo |  |  |  |  |
| DNQ | 18 | Alex Soler-Roig | March-Ford |  |  |  |  |
| DNQ | 28 | Skip Barber | March-Ford |  |  |  |  |


Question
how many drivers completed 80 laps?


Answer Format
The final answer should be concise and use the following format:
```json
{
    "answer": [
        "answer1",
        "answer2",
        ...
    ]
}
```
rule
["4"]