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 | Name | Nationality | Time (hand) | Notes |
| --- | --- | --- | --- | --- |
|  | Tommy Green | Great Britain | 4:50:10 | OR |
|  | Jānis Daliņš | Latvia | 4:57:20 |  |
|  | Ugo Frigerio | Italy | 4:59:06 |  |
| 4 | Karl Hähnel | Germany | 5:06:06 |  |
| 5 | Ettore Rivolta | Italy | 5:07:39 |  |
| 6 | Paul Sievert | Germany | 5:16:41 |  |
| 7 | Henri Quintric | France | 5:27:25 |  |
| 8 | Ernie Crosbie | United States | 5:28:02 |  |
| 9 | Bill Chisholm | United States | 5:51:00 |  |
| 10 | Alfred Maasik | Estonia | 6:19:00 |  |
|  | Henry Cieman | Canada |  | DNF |
|  | John Moralis | Greece |  | DNF |
|  | Francesco Pretti | Italy |  | DNF |
|  | Arthur Tell Schwab | Switzerland |  | DNF |
|  | Harry Hinkel | United States |  | DNF |
Question:
how many ranks are there?
Answer:
10