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. in series | No. in season | Title | Directed by | Written by | Original air date | Production | U.S. viewers (in millions) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 11.0 | 1.0 | "We Don't Need Another Hero" | Michael Zinberg | Janet Tamaro | July11,2011 | 2M5601 | 6.38 |
| 12.0 | 2.0 | "Living Proof" | Bethany Rooney | Dee Johnson | July18,2011 | 2M5602 | 6.39 |
| 13.0 | 3.0 | "Sailor Man" | Michael Zinberg | Joel Fields | July25,2011 | 2M5603 | 6.04 |
| 14.0 | 4.0 | "Brown Eyed Girl" | Mark Haber | Julie Hébert | August1,2011 | 2M5607 | 6.45 |
| 15.0 | 5.0 | "Don't Hate the Player" | Holly Dale | David Gould & Janet Tamaro | August8,2011 | 2M5604 | 6.46 |
| 16.0 | 6.0 | "Rebel Without a Pause" | Nelson McCormick | Elizabeth Benjamin & Janet Tamaro | August15,2011 | 2M5605 | 6.74 |
| 17.0 | 7.0 | "Bloodlines" | Michael Zinberg | Elizabeth Benjamin & Dee Johnson | August22,2011 | 2M5606 | 6.27 |
| 18.0 | 8.0 | "My Own Worst Enemy" | Terrence O'Hara | Joel Fields & Emilia Serrano | August29,2011 | 2M5608 | 6.71 |
| 19.0 | 9.0 | "Gone Daddy Gone" | Fred Toye | David Gould & Dee Johnson | September5,2011 | 2M5609 | 6.69 |
| 20.0 | 10.0 | "Remember Me" | Randy Zisk | David J. North & Janet Tamaro | September12,2011 | 2M5610 | 5.63 |
| 21.0 | 11.0 | "Can I Get A Witness?" | Andy Wolk | Janet Tamaro & Elizabeth Benjamin | November28,2011 | 2M5611 | 4.78 |
| 22.0 | 12.0 | "He Ain't Heavy, He's My Brother" | Steve Robin | David Gould & Dee Johnson | December5,2011 | 2M5612 | 3.86 |
| 23.0 | 13.0 | "Seventeen Ain't So Sweet" | Rod Holcomb | Shelley Meals & Darin Goldberg | December12,2011 | 2M5613 | 4.91 |
Question:
How many episodes were written by david j. north & janet tamaro?
Answer:
1.0