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 | Heat : Lane | Name | Nationality | Time |
| --- | --- | --- | --- | --- |
| 1.0 | 5 : 4 | Craig Stevens | Australia | 7:50.72 |
| 2.0 | 4 : 5 | Federico Colbertaldo | Italy | 7:50.77 |
| 3.0 | 6 : 3 | Oussama Mellouli | Tunisia | 7:51.48 |
| 4.0 | 6 : 2 | Ryan Cochrane | Canada | 7:51.55 |
| 5.0 | 6 : 4 | Grant Hackett | Australia | 7:51.86 |
| 6.0 | 5 : 5 | Przemysław Stańczyk | Poland | 7:52.40 |
| 7.0 | 4 : 7 | Sergiy Fesenko | Ukraine | 7:52.64 |
| 8.0 | 4 : 3 | Sébastien Rouault | France | 7:52.92 |
| 9.0 | 5 : 6 | Peter Vanderkaay | USA | 7:54.37 |
| 10.0 | 5 : 2 | Erik Vendt | USA | 7:54.48 |
| 11.0 | 5 : 1 | Luka Turk | Slovenia | 7:54.58 |
| 12.0 | 6 : 6 | Nikita Lobintsev | Russia | 7:56.91 |
| 13.0 | 4 : 6 | Marcos Rivera Miranda | Spain | 7:57.14 |
| 14.0 | 6 : 7 | Mads Glæsner | Denmark | 7:59.43 |
| 15.0 | 4 : 1 | Dragoş Coman | Romania | 7:59.91 |
| 16.0 | 4 : 2 | Vitaly Romanovich | Russia | 7:59.94 |
| 17.0 | 4 : 4 | Christian Hein | Germany | 8:00.14 |
| 18.0 | 6 : 5 | Nicolas Rostoucher | France | 8:03.03 |
| 19.0 | 5 : 7 | Maciej Hreniak | Poland | 8:05.01 |
| 20.0 | 5 : 8 | David Brandl | Austria | 8:05.48 |
| 21.0 | 3 : 4 | Ricardo Monasterio | Venezuela | 8:05.81 |
| 22.0 | 3 : 3 | Fernando Costa | Portugal | 8:06.44 |
| 23.0 | 1 : 7 | Sun Yang | China | 8:08.12 |
| 24.0 | 3 : 7 | Ahmed Mathlouthi | Tunisia | 8:09.59 |
| 25.0 | 6 : 1 | Felipe Araújo | Brazil | 8:10.50 |
| 26.0 | 6 : 8 | Armando Negreiros | Brazil | 8:11.01 |
| 27.0 | 1 : 2 | Ren Chen | China | 8:12.32 |
| 28.0 | 3 : 2 | Robert Voss | New Zealand | 8:13.78 |
| 29.0 | 3 : 6 | Florian Janistyn | Austria | 8:14.26 |
| 30.0 | 3 : 1 | Caglar Gokbulut | Turkey | 8:19.08 |
| 31.0 | 4 : 8 | Shinya Taniguchi | Japan | 8:25.83 |
| 32.0 | 2 : 3 | Benjamin Guzman Blanco | Chile | 8:26.24 |
| 33.0 | 2 : 5 | Mario Montoya | Costa Rica | 8:27.47 |
| 34.0 | 2 : 8 | Pál Joensen | Faroe Islands | 8:30.31 |
| 35.0 | 3 : 8 | Irakli Revishvili | Georgia | 8:31.52 |
| 36.0 | 2 : 4 | Kevin Soow Choy Yeap | Malaysia | 8:32.35 |
| 37.0 | 3 : 5 | Erwin Maldonado | Venezuela | 8:38.69 |
| 38.0 | 2 : 6 | Micky van der Vaart | Aruba | 8:39.17 |
| 39.0 | 1 : 4 | Neil Agius | Malta | 8:57.63 |
| 40.0 | 2 : 7 | Davor Trnovljakovic | Bosnia and Herzegovina | 9:01.70 |
| 41.0 | 1 : 5 | Heimanu Sichan | Tahiti | 9:09.79 |
| 42.0 | 2 : 1 | Timur Kartabaev | Kyrgyzstan | 9:27.31 |
| 43.0 | 1 : 3 | Cooper Graf | Northern Mariana Islands | 10:14.48 |
| 999.0 | 1 : 6 | Ibraihm Assah | Ghana | DNS |
| 999.0 | 2 : 2 | Anas Abuyousuf | Qatar | DNS |
| 999.0 | 5 : 3 | Andrew Hurd | Canada | DNS |
Question:
How many ranks have a ationality of canada, and a Time of dns?
Answer:
1.0