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:
| Season # | Series # | Title | Canadian airdate | U.S. airdate | Production code |
| --- | --- | --- | --- | --- | --- |
| 1.0 | 14.0 | "Dangerous Liaisons" | April 21, 2009 | April 3, 2009 | 201.0 |
| 2.0 | 15.0 | "Documentary" | April 27, 2009 | April 10, 2009 | 202.0 |
| 3.0 | 16.0 | "Dermabrasion" | May 4, 2009 | April 17, 2009 | 203.0 |
| 4.0 | 17.0 | "Different Hearts" | May 11, 2009 | April 24, 2009 | 204.0 |
| 5.0 | 18.0 | "Destiny" | May 18, 2009 | May 1, 2009 | 205.0 |
| 6.0 | 19.0 | "Duluth, Minnesota" | May 25, 2009 | May 8, 2009 | 206.0 |
| 7.0 | 20.0 | "Debtor's Prison" | June 1, 2009 | May 15, 2009 | 207.0 |
Question:
What is the maximum season # with a u.s. air date is may 1, 2009
Answer:
5.0