|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