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:
| District | Name | Party | District Office | First elected |
| --- | --- | --- | --- | --- |
| 1 | A.G. Crowe | Rep | Slidell | 2007 |
| 2 | Troy Brown | Dem | Napoleonville | 2011 |
| 3 | J.P. Morrell | Dem | New Orleans | 2008† |
| 4 | Ed Murray | Dem | New Orleans | 2005† |
| 5 | Karen Carter Peterson | Dem | New Orleans | 2010† |
| 6 | Bodi White | Rep | Baton Rouge | 2011 |
| 7 | David Heitmeier | Dem | New Orleans | 2007 |
| 8 | John Alario | Rep | Westwego | 2007 |
| 9 | Conrad Appel | Rep | Metairie | 2008† |
| 10 | Daniel Martiny | Rep | Metairie | 2007 |
| 11 | Jack Donahue | Rep | Mandeville | 2007 |
| 12 | Ben Nevers | Dem | Bogalusa | 2003 |
| 13 | Dale M. Erdey | Rep | Livingston | 2007 |
| 14 | Yvonne Dorsey-Colomb | Dem | Baton Rouge | 2007 |
| 15 | Sharon Weston Broome | Dem | Baton Rouge | 2004† |
| 16 | Dan Claitor | Rep | Baton Rouge | 2009† |
| 17 | Rick Ward, III | Rep | Port Allen | 2011 |
| 18 | Jody Amedee | Rep | Gonzales | 2003 |
| 19 | Gary Smith, Jr. | Dem | Norco | 2011 |
| 20 | Norby Chabert | Rep | Houma | 2009† |
| 21 | Bret Allain | Rep | Franklin | 2011 |
| 22 | Fred H. Mills, Jr. | Rep | New Iberia | 2011† |
| 23 | Page Cortez | Rep | Lafayette | 2011 |
| 24 | Elbert Guillory | Rep | Opelousas | 2009† |
| 25 | Dan "Blade" Morrish | Rep | Jennings | 2007 |
| 26 | Jonathan Perry | Rep | Kaplan | 2011† |
| 27 | Ronnie Johns | Rep | Lake Charles | 2011 |
| 28 | Eric LaFleur | Dem | Ville Platte | 2007 |
| 29 | Rick Gallot | Dem | Ruston | 2011 |
| 30 | John R. Smith | Rep | Leesville | 2007 |
| 31 | Gerald Long | Rep | Winnfield | 2007 |
| 32 | Neil Riser | Rep | Columbia | 2007 |
| 33 | Mike Walsworth | Rep | West Monroe | 2007 |
| 34 | Francis C. Thompson | Dem | Delhi | 2007 |
| 35 | Robert Kostelka | Rep | Monroe | 2003 |
| 36 | Robert Adley | Rep | Benton | 2003 |
| 37 | Barrow Peacock | Rep | Bossier | 2011 |
| 38 | Sherri Smith Buffington | Rep | Keithville | 2003 |
| 39 | Gregory Tarver | Dem | Shreveport | 2011 |
Question:
how many senators are from baton rouge?
Answer:
4