Table:
text: 2008 Australian motorcycle Grand Prix
250 cc classification
250 cc classification
Pos No_ Rider Manufacturer Laps Time_ Grid Points_
1 58 Marco Simoncelli Gilera 25 39:02.553 1 25
2 19 Álvaro Bautista Aprilia 25 +0.223 3 20
3 36 Mika Kallio KTM 25 +14.450 2 16
4 60 Julian Simon KTM 25 +14.478 6 13
5 6 Alex Debon Aprilia 25 +26.226 8 11
6 15 Roberto Locatelli Gilera 25 +26.392 11 10
7 72 Yuki Takahashi Honda 25 +26.434 7 9
8 41 Aleix Espargaro Aprilia 25 +40.546 9 8
9 14 Ratthapark Wilairot Honda 25 +1:00.219 12 7
10 32 Fabrizio Lai Gilera 25 +1:20.825 13 6
11 17 Karel Abraham Aprilia 25 +1:22.802 17 5

text: 2008 Australian motorcycle Grand Prix
250 cc classification
250 cc classification
Pos No_ Rider Manufacturer Laps Time_ Grid Points_
12 25 Alex Baldolini Aprilia 25 +1:22.864 18 4
13 10 Imre Toth Aprilia 25 +1:23.995 16 3
14 52 Lukas Pesek Aprilia 25 +1:39.740 14 2
15 35 Simone Grotzkyj Gilera 24 +1 Lap 21 1
16 92 Daniel Arcas Honda 24 +1 Lap 20 
17 45 Doni Tata Pradita Yamaha 24 +1 Lap 22 
Ret 4 Hiroshi Aoyama KTM 15 Retirement 4 
Ret 75 Mattia Pasini Aprilia 15 Accident 10 
Ret 55 Héctor Faubel Aprilia 4 Accident 5 
Ret 90 Federico Sandi Aprilia 1 Accident 15 
Ret 43 Manuel Hernandez Aprilia 1 Retirement 19 
DNQ 27 Stefano Bianco Gilera    
DNQ 89 Ho Wan Chow Aprilia

Question: What is the total number of riders for the 2008 Australian Motorcycle Grand Prix?