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 | Lane | Name | Nationality | React | Time | Notes |
| --- | --- | --- | --- | --- | --- | --- |
| 1 | 4 | Yelizaveta Bryzhina | Ukraine | 0.245 | 23.10 | Q |
| 2 | 6 | Myriam Soumaré | France | 0.179 | 23.22 | Q |
| 3 | 3 | Ksenija Balta | Estonia | 0.205 | 23.75 | Q |
| 4 | 5 | Niamh Whelan | Ireland | 0.253 | 23.78 | q |
| 5 | 7 | Sabina Veit | Slovenia | 0.205 | 23.78 |  |
| 6 | 2 | Elin Backman | Sweden | 0.217 | 24.13 |  |
|  |  |  |  | Wind: -2.6 m/s | Wind: -2.6 m/s | Wind: -2.6 m/s |
Question:
what number of last names start with "b"?
Answer:
3