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 | Stadium | Capacity | City | Country |
| --- | --- | --- | --- | --- |
| 1.0 | Queensland Sport and Athletics Centre | 49000.0 | Brisbane | Australia |
| 2.0 | Estadio Olímpico de Sevilla | 27200.0 | Seville | Spain |
| 3.0 | Belgrade Arena | 23000.0 | Belgrade | Serbia |
| 4.0 | Las Ventas | 21000.0 | Madrid | Spain |
| 5.0 | Royal Dublin Society | 6000.0 | Dublin | Ireland |
| 6.0 | O2 Arena (Prague) | 17000.0 | Prague | Czech Republic |
| 7.0 | Palau Sant Jordi | 16500.0 | Barcelona | Spain |
| 8.0 | Estadio Mary Terán de Weiss | 14510.0 | Buenos Aires | Argentina |
| 9.0 | Palacio de Deportes de Santander | 14000.0 | Santander | Spain |
| 10.0 | Memorial Coliseum | 12000.0 | Portland, Oregon | United States |
| 11.0 | Nokia Arena | 11700.0 | Tel Aviv | Israel |
| 12.0 | Public Auditorium | 11500.0 | Cleveland | United States |
| 13.0 | Mediolanum Forum | 11200.0 | Milan | Italy |
| 14.0 | Bill Graham Civic Auditorium | 7000.0 | San Francisco | United States |
| 15.0 | Sibamac Arena | 4500.0 | Bratislava | Slovakia |
| 16.0 | Idrottens Hus | 2400.0 | Helsingborg | Sweden |
Question:
Which Capacity is the lowest one that has a Rank smaller than 15, and a City of belgrade?
Answer:
23000.0