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 | Season | Ep | Title | Writer | Director | Original airdate | Archive |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 2.0 | 1.0 | 1.0 | 'The Good Ones Are All Dead' | James Mitchell | Toby Robertson | 8 July 1967 | Survives |
| 3.0 | 1.0 | 2.0 | 'Goodbye, Nobby Clarke' | Robert Banks Stewart | Peter Duguid | 15 July 1967 | Missing |
| 4.0 | 1.0 | 3.0 | 'The Death of Robert E Lee' | James Mitchell | Robert Tronson | 22 July 1967 | Missing |
| 5.0 | 1.0 | 4.0 | 'Goodness Burns Too Bright' | James Mitchell | Bill Bain | 29 July 1967 | Missing |
| 6.0 | 1.0 | 5.0 | 'But He's a Lord, Mr Callan' | James Mitchell | Guy Verney | 5 August 1967 | Missing |
Question:
Name the number of writers for airdate of 15 july 1967
Answer:
1.0