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:
| Series no. | Season no. | Title | Directed by | Written by | Original air date | Production code | U.S. viewers (millions) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 18.0 | 1.0 | "Run, Dr. Lola Spratt, Run" | Rob Schrab | Rob Corddry | June2,2011 | 301.0 | 1.54 |
| 19.0 | 2.0 | "Ward 8" | Rob Schrab | Jason Mantzoukas | June9,2011 | 307.0 | 1.34 |
| 20.0 | 3.0 | "The Black Doctor" | Steve Pink | Rob Corddry | June16,2011 | 302.0 | 1.66 |
| 21.0 | 4.0 | "Home Is Where the Hospital Is" | Michael Patrick Jann | Erica Oyama | June23,2011 | 311.0 | 1.78 |
| 22.0 | 5.0 | "Nip/Tug" | Dylan Kidd | Brian Huskey | June30,2011 | 304.0 | 1.59 |
| 23.0 | 6.0 | "70's Episode" | Steve Pink | Rob Corddry | July7,2011 | 306.0 | 1.40 |
| 24.0 | 7.0 | "Father's Day" | Tristram Shapeero | Jonathan Stern | July14,2011 | 308.0 | 1.59 |
| 25.0 | 8.0 | "Stryker Bites the Dust" | Dylan Kidd | Rob Huebel & Paul Scheer | July21,2011 | 313.0 | 1.38 |
| 26.0 | 9.0 | "Childrens Hospital: A Play in Three Acts" | Michael Patrick Jann | Rob Corddry & Jonathan Stern & David Wain | July28,2011 | 314.0 | N/A |
| 27.0 | 10.0 | "Munch by Proxy" | Tristram Shapeero | Rob Corddry | August4,2011 | 305.0 | N/A |
| 28.0 | 11.0 | "Night Shift" | Rob Schrab | Jason Mantzoukas | August11,2011 | 309.0 | 1.63 |
| 29.0 | 12.0 | "Chet Episode" | Tristram Shapeero | Seth Morris | August18,2011 | 310.0 | 1.66 |
| 30.0 | 13.0 | "Party Down" | Rob Schrab | Rob Schrab | August25,2011 | 312.0 | 1.61 |
Question:
at most what number in the series was the episode "chet episode"?
Answer:
29.0