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:
| Date | Position | Name | From | Fee |
| --- | --- | --- | --- | --- |
| 5 July 2001 | MF | Andy Hughes | Notts County | £250,000 by a tribunal |
| 5 July 2001 | DF | Adrian Whitbread | Portsmouth | Free |
| 18 July 2001 | DF | Alex Smith | Port Vale | Free |
| 30 November 2001 | GK | Antony Malessa | Oxford United | Free |
| 28 January 2002 | MF | John Salako | Charlton Athletic | £50,000 |
| 13 March 2002 | GK | Frank Talia | Sheffield United | Free |
| 15 March 2002 | MF | Kevin Watson | Charlton Athletic | £150,000 |
Question:
what is the total number of free fees?
Answer:
4