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:
| Episode | Original title | Directed by | Written by | Original airdate | Duration | Viewership |
| --- | --- | --- | --- | --- | --- | --- |
| 8.0 | " Testing Times " | Dewi Humphreys | Jim Sullivan | 15September2006 | 30 minutes | 5.04 million |
| 9.0 | " Here's to You, Mrs Boyce " | Dewi Humphreys | John Sullivan | 22September2006 | 30 minutes | 4.79 million |
| 10.0 | " Bothered and Bewildered " | Dewi Humphreys | Derren Litten and John Sullivan | 29September2006 | 30 minutes | 4.77 million |
| 11.0 | " Mother Earth " | Dewi Humphreys | Jim Sullivan | 6October2006 | 30 minutes | 5.01 million |
| 12.0 | " Schoolboy French " | Dewi Humphreys | James Windett and John Sullivan | 13October2006 | 30 minutes | 4.96 million |
| 13.0 | " More Questions Than Answers " | Dewi Humphreys | Paul Alexander and John Sullivan | 20October2006 | 30 minutes | 3.90 million |
Question:
How many episodes  of 30 minutes were written by John Sullivan?
Answer:
1.0