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:
| Institution | Location | Established | Gained university status | Vice-chancellor | Total number of students | Research funding (£,000) |
| --- | --- | --- | --- | --- | --- | --- |
| Birkbeck, University of London | London | 1823 | 1920 | Professor David Latchman | 19,020 | 9,985 |
| University of East Anglia | Norwich | 1963 | 1963 | Professor Edward Acton | 19,585 | 16,482 |
| University of Essex | Colchester | 1964 | 1964 | Professor Anthony Forster | 11,690 | 9,967 |
| Goldsmiths, University of London | London | 1891 | 1904 | Dr Pat Loughrey | 7,615 | 8,539 |
| Institute of Education, University of London | London | 1902 | 1932 | Professor Chris Husbands | 7,215 | 7,734 |
| University of Lancaster | Lancaster | 1964 | 1964 | Professor Mark Smith | 12,695 | 18,640 |
| University of Leicester | Leicester | 1921 | 1957 | Professor Robert Burgess | 16,160 | 22,225 |
| Loughborough University | Loughborough | 1909 | 1966 | Professor Robert Allison | 17,825 | 22,398 |
| Royal Holloway, University of London | Egham | 1849 | 1900 | Professor Paul Layzell (Principal) | 7,620 | 13,699 |
| SOAS, University of London | London | 1916 | 1916 | Professor Paul Webley | 4,525 | 7,238 |
| University of Sussex | Brighton | 1961 | 1961 | Professor Michael Farthing | 12,415 | 16,196 |
Question:
how many of the institutions are located in london?
Answer:
4