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:
| Club | Played | Won | Drawn | Lost | Points for | Points against | Tries for | Tries against | Try bonus | Losing bonus | Points |
| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Club | Played | Won | Drawn | Lost | Points for | Points against | Tries for | Tries against | Try bonus | Losing bonus | Points |
| Caernarfon RFC | 22 | 18 | 1 | 3 | 643 | 235 | 101 | 24 | 14 | 1 | 89 |
| Colwyn Bay RFC | 22 | 18 | 0 | 4 | 570 | 256 | 79 | 29 | 10 | 3 | 85 |
| Nant Conwy RFC | 22 | 16 | 0 | 6 | 585 | 177 | 84 | 21 | 11 | 4 | 79 |
| Mold RFC | 22 | 16 | 0 | 6 | 596 | 239 | 85 | 27 | 11 | 3 | 78 |
| Ruthin RFC | 22 | 15 | 2 | 5 | 599 | 198 | 89 | 21 | 9 | 3 | 76 |
| Llangefni RFC | 22 | 13 | 0 | 9 | 504 | 311 | 69 | 42 | 9 | 5 | 66 |
| Llandudno RFC | 22 | 9 | 0 | 13 | 436 | 498 | 59 | 73 | 6 | 3 | 45 |
| Denbigh RFC | 22 | 7 | 0 | 15 | 348 | 467 | 50 | 69 | 5 | 5 | 38 |
| Bala RFC | 22 | 8 | 0 | 14 | 282 | 443 | 37 | 61 | 3 | 2 | 37 |
| Dolgellau RFC | 22 | 6 | 1 | 15 | 250 | 538 | 32 | 80 | 3 | 3 | 32 |
| Llanidloes RFC | 22 | 2 | 0 | 20 | 171 | 835 | 19 | 128 | 0 | 2 | 10 |
| Newtown RFC | 22 | 2 | 0 | 20 | 109 | 896 | 10 | 139 | 0 | 2 | 10 |
Question:
what's the won with points for being 643
Answer:
18.0