请阅读下面这张Markdown格式的表格并回答问题。同一行中不同列的单元格用'|'分隔，不同行的单元格用'
'分隔。

表格:
| 排名 | 驾校名称 | 教练车数 | 考试人数 | 合格人数 | 合格率 |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 驾训驾校 | 110.0 | 280.0 | 238.0 | 0.85 |
| 2.0 | 亿安达驾校 | 135.0 | 799.0 | 644.0 | 0.806 |
| 3.0 | 南航驾校 | 172.0 | 495.0 | 395.0 | 0.798 |
| 4.0 | 交大驾校 | 93.0 | 805.0 | 621.0 | 0.7714 |
| 5.0 | 赣洪驾校 | 100.0 | 476.0 | 365.0 | 0.7668 |
| 6.0 | 航天驾校 | 56.0 | 437.0 | 306.0 | 0.7002 |
| 7.0 | 人才驾校 | 72.0 | 368.0 | 253.0 | 0.6875 |
| 8.0 | 赣安驾校 | 108.0 | 765.0 | 523.0 | 0.6837 |
| 9.0 | 弘屹驾校 | 20.0 | 224.0 | 150.0 | 0.6696 |
| 10.0 | 尚诚驾校 | 40.0 | 284.0 | 190.0 | 0.669 |
| 11.0 | 国力驾校 | 103.0 | 893.0 | 586.0 | 0.6562 |
| 12.0 | 蓝天驾校 | 624.0 | 2801.0 | 1828.0 | 0.6526 |
| 13.0 | 金领驾校 | 186.0 | 394.0 | 254.0 | 0.6447 |
| 14.0 | 天成驾校 | 34.0 | 60.0 | 38.0 | 0.6333 |
| 15.0 | 飞翔驾校 | 40.0 | 182.0 | 115.0 | 0.6319 |
| 16.0 | 昌大驾校 | 35.0 | 543.0 | 341.0 | 0.628 |
| 17.0 | 先锋驾校 | 30.0 | 179.0 | 112.0 | 0.6257 |
| 18.0 | 城院驾校 | 55.0 | 291.0 | 181.0 | 0.622 |
| 19.0 | 丽人驾校 | 36.0 | 164.0 | 102.0 | 0.622 |
| 20.0 | 白云驾校 | 206.0 | 1543.0 | 943.0 | 0.6111 |
| 21.0 | 易通驾校 | 43.0 | 283.0 | 172.0 | 0.6078 |
| 22.0 | 洪安驾校 | 30.0 | 407.0 | 247.0 | 0.6069 |
| 23.0 | 天祥驾校 | 51.0 | 960.0 | 579.0 | 0.6031 |
| 24.0 | 安义驾校 | 40.0 | 200.0 | 120.0 | 0.6 |
| 25.0 | 赣江驾校 | 34.0 | 162.0 | 96.0 | 0.5926 |
| 26.0 | 红谷驾校 | 57.0 | 659.0 | 376.0 | 0.5706 |
| 27.0 | 进贤飞翔驾校 | 34.0 | 64.0 | 36.0 | 0.5625 |
| 28.0 | 翔云驾校 | 51.0 | 346.0 | 194.0 | 0.5607 |
| 29.0 | 现代驾校 | 34.0 | 565.0 | 312.0 | 0.5522 |
| 30.0 | 龙腾驾校 | 40.0 | 172.0 | 94.0 | 0.5465 |
| 31.0 | 江农驾校 | 20.0 | 262.0 | 143.0 | 0.5458 |
| 32.0 | 汽运驾校 | 26.0 | 279.0 | 152.0 | 0.5448 |
| 33.0 | 天元驾校 | 46.0 | 577.0 | 313.0 | 0.5425 |
| 34.0 | 洪星驾校 | 32.0 | 346.0 | 186.0 | 0.5376 |
| 35.0 | 新新安驾校 | 66.0 | 865.0 | 462.0 | 0.5341 |
| 36.0 | 交院驾校 | 41.0 | 324.0 | 170.0 | 0.5247 |
| 37.0 | 三职驾校 | 13.0 | 385.0 | 195.0 | 0.5065 |
| 38.0 | 京开驾校 | 21.0 | 192.0 | 97.0 | 0.5052 |
| 39.0 | 新发驾校 | 35.0 | 292.0 | 147.0 | 0.5034 |
| 40.0 | 华远驾校 | 21.0 | 403.0 | 199.0 | 0.4938 |
| 41.0 | 广生驾校 | 40.0 | 437.0 | 213.0 | 0.4874 |
| 42.0 | 东昇驾校 | 23.0 | 146.0 | 71.0 | 0.4863 |
| 43.0 | 千家驾校 | 64.0 | 286.0 | 137.0 | 0.479 |
| 44.0 | 环球通驾校 | 40.0 | 460.0 | 218.0 | 0.4739 |
| 45.0 | 腾飞驾校 | 40.0 | 106.0 | 50.0 | 0.4717 |
| 46.0 | 驰善驾校 | 17.0 | 97.0 | 45.0 | 0.4639 |
| 47.0 | 中航驾校 | 72.0 | 856.0 | 394.0 | 0.4603 |
| 48.0 | 文峰驾校 | 40.0 | 163.0 | 75.0 | 0.4601 |
| 49.0 | 大宇驾校 | 49.0 | 134.0 | 61.0 | 0.4552 |
| 50.0 | 永顺驾校 | 22.0 | 192.0 | 86.0 | 0.4479 |
| 51.0 | 华安驾校 | 22.0 | 73.0 | 32.0 | 0.4384 |
| 52.0 | 金成驾校 | 37.0 | 399.0 | 170.0 | 0.4261 |
| 53.0 | 金盾驾校 | 132.0 | 480.0 | 204.0 | 0.425 |
| 54.0 | 南莲驾校 | 70.0 | 568.0 | 241.0 | 0.4243 |
| 55.0 | 扬子驾校 | 63.0 | 315.0 | 127.0 | 0.4032 |
| 56.0 | 豫章驾校 | 65.0 | 69.0 | 27.0 | 0.3913 |
| 57.0 | 新赣线驾校 | 44.0 | 177.0 | 69.0 | 0.3898 |
| 58.0 | 一路通驾校 | 48.0 | 830.0 | 322.0 | 0.388 |
问题:
南航驾校有多少辆教练车啊
Answer:
172.0