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. | Name | Position | Date of Birth (Age) | Signed from | Notes |
| --- | --- | --- | --- | --- | --- |
| 1 | Leonardo Burián | GK | January 21, 1984 (age 30) | Bella Vista | First team goalkeeper |
| 2 | Darwin Torres | DF | February 16, 1991 (age 23) | The Academy | Reserve team player |
| 3 | Jadson Viera | DF | August 4, 1981 (age 32) | Vasco da Gama | AUF player |
| 4 | Christian Núñez | DF | September 24, 1982 (age 31) | Cerro |  |
| 5 | Santiago Romero | MF | February 15, 1990 (age 24) | The Academy | Reserve team player |
| 6 | Alexis Rolín | DF | March 2, 1989 (age 25) | The Academy |  |
| 7 | Rafael García | MF | January 6, 1989 (age 25) | Rampla Juniors |  |
| 8 | Matías Cabrera | MF | May 16, 1986 (age 28) | Cerro |  |
| 9 | Alexander Medina | FW | August 8, 1978 (age 35) | River Plate | Captain |
| 10 | Tabaré Viudez | FW | September 8, 1989 (age 24) | Necaxa |  |
| 11 | Vicente Sánchez | FW | December 7, 1979 (age 34) | América | In on 15 January 2012 |
| 12 | Martín Tejera | GK | February 16, 1991 (age 23) | The Academy |  |
| 13 | Pablo Álvarez | DF | February 7, 1985 (age 29) | Panserraikos | In on 3 January 2012 |
| 14 | Diego Placente | DF | April 24, 1977 (age 37) | San Lorenzo |  |
| 15 | Gonzalo Bueno | FW | September 1, 1991 (age 22) | The Academy |  |
| 16 | Mathías Abero | DF | April 9, 1990 (age 24) | Racing |  |
| 17 | Maximiliano Calzada | MF | April 21, 1990 (age 24) | The Academy |  |
| 18 | Israel Damonte | MF | January 6, 1982 (age 32) | Godoy Cruz | In on 19 January 2012 |
| 19 | Andrés Scotti | DF | December 14, 1975 (age 38) | Colo-Colo | In on 3 January 2012 |
| 20 | Álvaro Recoba | MF | March 17, 1976 (age 38) | Danubio | Vice-captain |
| 21 | Matías Vecino | MF | August 24, 1991 (age 22) | Central Español |  |
| 22 | Joaquín Boghossian | FW | June 19, 1987 (age 27) | Red Bull Salzburg |  |
| 23 | Facundo Píriz | MF | March 27, 1990 (age 24) | The Academy |  |
| 24 | Marcos Aguirre | MF | March 30, 1984 (age 30) | San Martín (San Juan) | In on 12 January 2012 |
| 25 | Jorge Bava | GK | January 22, 1982 (age 32) | Cerro | In on 13 January 2012 |
| – | Rodrigo Muñoz | GK | January 22, 1982 (age 32) | Cerro | Out on 10 January 2012 |
| – | Diego Barboza | DF | January 9, 1991 (age 23) | The Academy | Reserve team player |
| – | Sebastián Coates | DF | October 7, 1990 (age 23) | The Academy | Out on 26 August 2011 |
| – | Gabriel Marques | DF | March 31, 1983 (age 31) | River Plate | Out on 29 December 2011 |
| – | Gonzalo Godoy | DF | January 17, 1988 (age 26) | Cerro | Out on 5 January 2012 |
| – | Sebastián Gorga | DF | April 6, 1994 (age 20) | The Academy | Reserve team player |
| – | Maximiliano Moreira | DF | June 11, 1994 (age 20) | The Academy | Reserve team player |
| – | Nicolás Olivera | DF | February 17, 1993 (age 21) | The Academy | Reserve team player |
| – | Fernando Poclaba | DF | January 23, 1990 (age 24) | Racing | Out on 31 December 2012 |
| – | Agustín Tabárez | DF | October 15, 1994 (age 19) | The Academy | Reserve team player |
| – | Anderson Silva | MF | August 28, 1982 (age 31) | Barnsley | End of contract on 31 December 2011 |
| – | Ayrton Bone | MF | May 27, 1994 (age 20) | The Academy | Reserve team player |
| – | Carlos De Pena | MF | March 11, 1992 (age 22) | The Academy | Reserve team player |
| – | Hugo Dorrego | MF | May 9, 1993 (age 21) | The Academy | Reserve team player |
| – | Damián Eroza | MF | March 22, 1993 (age 21) | The Academy | Reserve team player |
| – | Horacio Peralta | MF | June 3, 1982 (age 32) | Central Español | End of contract on 31 December 2011 |
| – | Gastón Pereiro | MF | June 11, 1995 (age 19) | The Academy | Reserve team player |
| – | Santiago Pereyra | MF | June 2, 1992 (age 22) | The Academy | Reserve team player |
| – | Santiago Saúl | MF | January 8, 1993 (age 21) | The Academy | Reserve team player |
| – | Matías Sosa | MF | June 26, 1992 (age 21) | Sporting de Gijón B | End of contract on 31 December 2011 |
| – | Gonzalo Vega | MF | June 29, 1992 (age 21) | The Academy | Reserve team player |
| – | Leandro Barcia | FW | October 8, 1993 (age 20) | The Academy | Reserve team player |
| – | Lucas Cavallini | FW | December 28, 1992 (age 21) | The Academy | Reserve team player |
| – | Renato César | FW | April 8, 1993 (age 20) | The Academy |  |
| – | Jonathan Charquero | FW | February 21, 1989 (age 25) | Montevideo Wanderers | Out on 27 December 2011 |
| – | Sergio Cortelezzi | FW | September 9, 1994 (age 19) | The Academy | Reserve team player |
| – | Richard Porta | FW | January 8, 1985 (age 29) | Al Wasl | Out on 14 October 2011\nIn on 9 January, 2012 |
| – | Nicolás López | FW | September 9, 1993 (age 20) | The Academy | On 22 August 2011 he escaped with his representant\nPablo Bentancur and his family to Italy |
| – | Renzo López | FW | April 16, 1994 (age 20) | The Academy | Reserve team player |
| – | Juan Cruz Mascia | FW | January 3, 1994 (age 20) | Miramar Misiones | In on 19 January 2012 |
| – | Rodrigo Roque | FW | May 3, 1991 (age 23) | The Academy | Reserve team player |
Question:
what is the total number of "df" positions on the list?
Answer:
17