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:
| Year | Tournament | Venue | Result | Extra |
| --- | --- | --- | --- | --- |
| 2002 | European Indoor Championships | Vienna, Austria | 5th |  |
| 2003 | Universiade | Daegu, South Korea | 3rd |  |
| 2004 | World Indoor Championships | Budapest, Hungary | 1st | 2.04 PBi |
| 2004 | Summer Olympics | Athens, Greece | 1st | 2.06 NR |
| 2004 | World Athletics Final | Monte Carlo, Monaco | 1st |  |
| 2006 | World Indoor Championships | Moscow, Russia | 1st | 2.02 |
| 2006 | European Championships | Gothenburg, Sweden | 5th | 1.99 m |
| 2006 | World Athletics Final | Stuttgart, Germany | 4th |  |
| 2006 | World Cup | Athens, Greece | 1st | 1.97 |
| 2007 | World Championships | Osaka, Japan | 4th |  |
| 2008 | Summer Olympics | Beijing, China | 4th | 2.01 |
| 2011 | World Championships | Daegu, Korea | 4th | 1.97 |
Question:
how many summer olympics has yelena slesarenko participated in?
Answer:
2