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:
| Year | Title | Role | Network | Notes |
| --- | --- | --- | --- | --- |
| 2000 | Youth Y2K\n青春@Y2K | Cheng Shasha |  |  |
| 2001 | The Monkey King: Quest for the Sutra\n齊天大聖孫悟空 | Purple Orchid | TVB |  |
| 2001 | 藍寶石的夜空 | Shek Po-yi | TVB | Eason Chan's music video |
| 2002 | 一Twins零一夜 | Ah Sa | TVB | Music video |
| 2003 | Triumph in the Skies\n衝上雲霄 | Charlene | TVB | Cameo |
| 2003 | All About Boy'z\n一起喝采 | Langlang Princess | now.com.hk | Appearance in episode 2 |
| 2003 | 2半3更之困車立 | Ah Sa | now.com.hk |  |
| 2003 | 愛在陽光下 | AIDS patient |  | Music video produced to support the global anti-AIDS campaign |
| 2004 | Kung Fu Soccer\n功夫足球 |  | TVB | Guest star |
| 2004 | Sunshine Heartbeat\n赤沙印記@四葉草.2 | Ah Sa | TVB | Guest star |
| 2004 | 家有寶貝 | Ah Sa |  | Guest star |
| 2007 | Colours of Love\n森之愛情 | Wai-fong / Ching-lan | TVB |  |
| 2007 | Life Off Stage |  |  |  |
| 2010 | Calling for Love!\n呼叫大明星 | Chen Dexin | CTS |  |
| 2011 | The Legend of Swordman\n劍俠情緣 | Tang Xiaowan / Ning Xin |  |  |
| 2012 | Happy Marshal\n歡樂元帥 | Little Dragon Girl (Xiao Long Nu) |  |  |
Question:
how many appearances have no role listed?
Answer:
2