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:
| Total No. | Celebrity | Director | Original air date | Viewers |
| --- | --- | --- | --- | --- |
| 1.0 | Shaun Majumder | Scott Harper | 11October2007 | N/A |
| 2.0 | Margot Kidder | Margaret Slaght | 18October2007 | N/A |
| 3.0 | Steven Page | David Langer | 25October2007 | N/A |
| 4.0 | Sonja Smits | Karen Pinker | 1November2007 | N/A |
| 5.0 | Chantal Kreviazuk | Nadine Schwartz | 8November2007 | N/A |
| 6.0 | Major-General Lewis Mackenzie | Richard Martyn | 15November2007 | N/A |
| 7.0 | Mary Walsh | Matt Gallagher | 22November2007 | N/A |
| 8.0 | Randy Bachman | Margaret Slaght | 29November2007 | N/A |
| 9.0 | Scott Thompson | Scott Harper | 6December2007 | N/A |
| 10.0 | Don Cherry | Richard Martyn | 10January2008 | N/A |
| 11.0 | Measha Brueggergosman | Karen Pinker | 17January2008 | N/A |
| 12.0 | Margaret Trudeau | Peter Findlay | 24January2008 | N/A |
Question:
How many celebrities had an 18October2007 Original air Date?
Answer:
1.0