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:
| Series | Start date | End date | Episodes |
| --- | --- | --- | --- |
| 1 | 29 October 1986 | 31 December 1986 | 10 |
| 2 | 15 April 1987 | 24 June 1987 | 10 |
| 3 | 17 September 1987 | 28 January 1988 | 20 |
| 4 | 4 October 1988 | 14 February 1989 | 20 |
| 5 | 25 December 1989 | 4 June 1990 | 21 |
| 6 | 25 September 1990 | 12 February 1991 | 21 |
| 7 | 23 September 1991 | 26 December 1991 | 13 |
| 8 | 21 September 1992 | 28 December 1992 | 12 |
| 9 | 27 September 1993 | 27 December 1993 | 14 |
| 10 | 13 September 1994 | 29 December 1994 | 14 |
| 11 | 12 December 1996 | 3 April 1997 | 16 |
| 12 | 8 September 1997 | 29 December 1997 | 16 |
| 13 | 17 September 1998 | 31 December 1998 | 16 |
| 14 | 7 June 1999 | 23 August 1999 | 12 |
Question:
how many epiodes are in series 1-3 combined?
Answer:
40