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:
| Rank | Title | Studio | Director | Gross |
| --- | --- | --- | --- | --- |
| 1.0 | The Sound of Music * | 20th Century Fox | Robert Wise | $163,214,286 |
| 2.0 | Doctor Zhivago * | Metro-Goldwyn-Mayer | David Lean | $111,721,910 |
| 3.0 | Thunderball | United Artists | Terence Young | $63,595,658 |
| 4.0 | Those Magnificent Men in their Flying Machines | 20th Century Fox | Ken Annakin | $31,111,111 |
| 5.0 | That Darn Cat! | Walt Disney Productions | Robert Stevenson | $28,068,222 |
| 6.0 | The Great Race | Warner Bros. Pictures | Blake Edwards | $25,333,333 |
| 7.0 | Cat Ballou | Columbia Pictures | Elliot Silverstein | $20,666,667 |
| 8.0 | What's New Pussycat? | United Artists | Clive Donner | $18,820,000 |
| 9.0 | Shenandoah | Universal Pictures | Andrew V. McLaglen | $17,268,889 |
| 10.0 | Von Ryan's Express | 20th Century Fox | Mark Robson | $17,111,111 |
| 11.0 | The Greatest Story Ever Told | United Artists | George Stevens | $15,473,333 |
| 12.0 | For a Few Dollars More | United Artists | Sergio Leone | $15,000,000 |
| 13.0 | The Sandpiper | Metro-Goldwyn-Mayer | Vincente Minnelli | $13,691,111 |
| 14.0 | A Patch of Blue | Metro-Goldwyn-Mayer | Guy Green | $13,500,000 |
| 15.0 | The Sons of Katie Elder | Paramount Pictures | Henry Hathaway | $13,333,333 |
| 16.0 | Help! | United Artists | Richard Lester | $12,066,667 |
| 17.0 | How to Murder Your Wife | United Artists | Richard Quine | $12,000,000 |
| 18.0 | Darling | Embassy Pictures | John Schlesinger | $12,000,000 |
| 19.0 | The Agony and the Ecstasy | 20th Century Fox | Carol Reed | $8,000,000 |
| 20.0 | Do Not Disturb | 20th Century Fox | Ralph Levy , George Marshall | $8,000,000 |
| 21.0 | The Spy Who Came in from the Cold | Paramount | Martin Ritt | $7,600,000 |
| 22.0 | Ship of Fools | Columbia | Stanley Kramer | $7,000,000 |
| 23.0 | The Collector | Columbia | William Wyler | $7,000,000 |
| 24.0 | The Train | United Artists | John Frankenheimer | $6,800,000 |
Question:
What is the highest Rank, when Director is "Henry Hathaway"?
Answer:
15.0