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:
| Heat | Lane | Name | Nationality | Time |
| --- | --- | --- | --- | --- |
| 6.0 | 7.0 | Davide Rummolo | Italy | 2:12.75 |
| 4.0 | 5.0 | Daniel Málek | Czech Republic | 2:14.10 |
| 7.0 | 2.0 | Morgan Knabe | Canada | 2:14.18 |
| 7.0 | 7.0 | Maxim Podoprigora | Austria | 2:14.37 |
| 5.0 | 6.0 | Ryan Mitchell | Australia | 2:14.69 |
| 7.0 | 4.0 | Stéphan Perrot | France | 2:14.79 |
| 7.0 | 6.0 | Regan Harrison | Australia | 2:14.85 |
| 5.0 | 7.0 | Martin Gustavsson | Sweden | 2:15.02 |
| 6.0 | 2.0 | Domenico Fioravanti | Italy | 2:15.04 |
| 6.0 | 3.0 | Terence Parkin | South Africa | 2:15.06 |
| 6.0 | 1.0 | Norbert Rózsa | Hungary | 2:15.27 |
| 6.0 | 4.0 | Yohann Bernard | France | 2:15.35 |
| 5.0 | 3.0 | Akira Hayashi | Japan | 2:15.54 |
| 6.0 | 5.0 | Kyle Salyards | United States | 2:15.57 |
| 2.0 | 2.0 | Alexander Tkachev | Kyrgyzstan | 2:15.63 |
| 7.0 | 5.0 | Dmitry Komornikov | Russia | 2:15.70 |
| 7.0 | 3.0 | Kosuke Kitajima | Japan | 2:15.71 |
| 4.0 | 3.0 | Marek Krawczyk | Poland | 2:16.08 |
| 4.0 | 4.0 | Valērijs Kalmikovs | Latvia | 2:16.21 |
| 5.0 | 4.0 | Roman Sloudnov | Russia | 2:16.26 |
| 5.0 | 5.0 | Tom Wilkens | United States | 2:16.30 |
| 5.0 | 8.0 | Aliaksandr Hukau | Belarus | 2:16.93 |
| 5.0 | 1.0 | Benno Kuipers | Netherlands | 2:17.03 |
| 6.0 | 6.0 | Adam Whitehead | Great Britain | 2:17.16 |
| 4.0 | 8.0 | Jakob Jóhann Sveinsson | Iceland | 2:17.86 |
| 7.0 | 8.0 | José Couto | Portugal | 2:18.08 |
| 4.0 | 1.0 | Andrew Bree | Ireland | 2:18.14 |
| 2.0 | 6.0 | Oleg Lisogor | Ukraine | 2:18.28 |
| 3.0 | 2.0 | Joe Kyong-Fan | South Korea | 2:19.16 |
| 3.0 | 5.0 | Li Tsung-Chueh | Chinese Taipei | 2:19.30 |
| 4.0 | 7.0 | Steven Ferguson | New Zealand | 2:19.31 |
| 4.0 | 6.0 | Tal Stricker | Israel | 2:19.33 |
| 3.0 | 4.0 | Raiko Pachel | Estonia | 2:19.71 |
| 2.0 | 3.0 | Jarno Pihlava | Finland | 2:19.76 |
| 3.0 | 8.0 | Francisco Suriano | El Salvador | 2:20.10 |
| 2.0 | 5.0 | Jeremy Knowles | Bahamas | 2:20.31 |
| 1.0 | 4.0 | Andrés Bicocca | Argentina | 2:20.98 |
| 5.0 | 2.0 | Zhu Yi | China | 2:21.60 |
| 3.0 | 6.0 | Alvaro Fortuny | Guatemala | 2:21.78 |
| 3.0 | 1.0 | Muhammad Akbar Nasution | Indonesia | 2:23.81 |
| 4.0 | 2.0 | Ratapong Sirisanont | Thailand | 2:23.95 |
| 3.0 | 7.0 | Tam Chi Kin | Hong Kong | 2:24.04 |
| 3.0 | 3.0 | Juan José Madrigal | Costa Rica | 2:24.49 |
| 7.0 | 1.0 | Elvin Chia | Malaysia | 2:26.84 |
| 1.0 | 3.0 | Nguyen Ngoc Anh | Vietnam | 2:29.54 |
| 2.0 | 7.0 | Sergey Voytsekhovich | Uzbekistan | 2:30.23 |
| 1.0 | 5.0 | Leonard Ngoma | Zambia | 2:32.90 |
| 2.0 | 4.0 | Vadim Tatarov | Moldova | DNS |
| 6.0 | 8.0 | Jens Kruppa | Germany | DNS |
Question:
What is the heat number of the athlete who finished in 2:23.95?
Answer:
4.0