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:
| # | Employer | # of Employees |
| --- | --- | --- |
| 1 | Medline | 1,200 |
| 2 | Mundelein Park District | 422 |
| 3 | Amcor | 350 |
| 4 | Fremont School District 79 | 287 |
| 5 | University of Saint Mary of the Lake | 220 |
| 6 | Mundelein Elementary School District 75 | 213 |
| 7 | Mundelein High School | 211 |
| 8 | Village of Mundelein | 183 |
Question:
how many employers have at least 300 employees?
Answer:
3