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 airdate | Timeslot (approx.) | Viewers (millions) | Nightly rank |
| --- | --- | --- | --- | --- |
| 1.0 | 18 May 2008 | Sunday 6:30–7:30 pm | 1.351 | #5 |
| 2.0 | 25 May 2008 | Sunday 6:30–7:30 pm | 1.481 | #4 |
| 3.0 | 1 June 2008 | Sunday 6:30–7:30 pm | 1.514 | #4 |
| 4.0 | 8 June 2008 | Sunday 6:30–7:30 pm | 1.364 | #4 |
| 5.0 | 15 June 2008 | Sunday 6:30–7:30 pm | 1.515 | #3 |
| 6.0 | 22 June 2008 | Sunday 6:30–7:30 pm | 1.506 | #4 |
| 7.0 | 29 June 2008 | Sunday 6:30–7:30 pm | 1.512 | #4 |
| 8.0 | 6 July 2008 | Sunday 6:30–7:30 pm | 1.578 | #2 |
| 9.0 | 13 July 2008 | Sunday 6:30–7:30 pm | 1.68 | #2 |
| 10.0 | 20 July 2008 | Sunday 6:30–7:30 pm | 1.432 | #3 |
| 11.0 | 27 July 2008 | Sunday 6:30–7:30 pm | 1.547 | #4 |
| 12.0 | 31 August 2008 | Sunday 6:30–7:30 pm | 1.462 | #4 |
| 13.0 | 7 September 2008 | Sunday 6:30–7:30 pm | 1.349 | #4 |
| 14.0 | 10 November 2008 | Monday 7:30–9:00 pm | 1.677 | #1 |
| 15.0 | 17 November 2008 | Monday 7:30–8:30 pm | 1.324 | #4 |
Question:
What is the lowest episode number with an original airdate on 8 June 2008?
Answer:
4.0