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:
| Canal | Length (miles) | Locks | Max length (ft) | Width (ft) | Year opened | Year abandoned | Year restored |
| --- | --- | --- | --- | --- | --- | --- | --- |
| Aberdeenshire Canal | 18 | 18 |  |  | 1805 | 1854 |  |
| Buchan Canal |  |  |  |  |  |  |  |
| Caledonian Canal | 62 | 29 | 150 | 35 | 1822 |  |  |
| Crinan Canal | 9 | 15 | 86.75 | 19.65 | 1817 |  |  |
| Dingwall Canal | 1.1 | 0 |  |  | 1816 | 1840 |  |
| Forth and Clyde Canal | 35 | 38 | 68.58 | 19.75 | 1790 | 1963 | 2002 |
| Glasgow, Paisley and Johnstone Canal | 11 | 0 |  |  | 1811 | 1881 |  |
| Monkland Canal | 12.25 | 18 | 71 | 14 | 1794 | 1942 |  |
| Stevenston Canal | 2.25 | 0 |  | 13 | 1772 | 1830 |  |
| Union Canal | 31.5 | 3 | 63 | 12.5 | 1822 | 1930 | 2000 |
Question:
how many canals are longer than thirty miles?
Answer:
3