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:
| No. | Player | Birth Date | Weight | Height | Position | Current Club |
| --- | --- | --- | --- | --- | --- | --- |
| 4 | Ardo Kreek | August 7, 1986 (age 27) | 96 | 203 | Middle blocker | Paris Volley |
| 5 | Kert Toobal | June 3, 1979 (age 35) | 78 | 189 | Setter | Sivas 4 Eylül |
| 6 | Martti Juhkami | June 6, 1988 (age 26) | 96 | 196 | Spiker | TV Bühl |
| 7 | Argo Meresaar | January 13, 1980 (age 34) | 107 | 206 | Opposite | Bigbank Tartu |
| 8 | Kusti Nõlvak | November 6, 1991 (age 22) | 81 | 186 | Setter | TTÜ VK |
| 9 | Robert Täht | August 15, 1993 (age 20) | 80 | 190 | Spiker | Bigbank Tartu |
| 11 | Oliver Venno | May 23, 1990 (age 24) | 105 | 210 | Opposite | Rennes Volley 35 |
| 14 | Rait Rikberg | August 30, 1982 (age 31) | 80 | 174 | Libero | Bigbank Tartu |
| 16 | Edgar Järvekülg | June 12, 1988 (age 26) | 77 | 186 | Libero | Pärnu VK |
| 17 | Siim Ennemuist | December 5, 1989 (age 24) | 89 | 196 | Middle blocker | TTÜ VK |
| 18 | Jaanus Nõmmsalu | January 19, 1981 (age 33) | 94 | 200 | Spiker | TTÜ VK |
| 19 | Andri Aganits | September 7, 1993 (age 20) | 99 | 207 | Middle Blocker | TV Bühl |
Question:
how many players are middle blockers?
Answer:
3