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:
| Tie no | Home team | Score | Away team | Date |
| --- | --- | --- | --- | --- |
| 1 | Chester | 1–0 | Luton Town | 29 January 1977 |
| 2 | Liverpool | 3–0 | Carlisle United | 29 January 1977 |
| 3 | Nottingham Forest | 3–3 | Southampton | 29 January 1977 |
| Replay | Southampton | 2–1 | Nottingham Forest | 1 February 1977 |
| 4 | Blackburn Rovers | 3–0 | Orient | 29 January 1977 |
| 5 | Aston Villa | 3–0 | West Ham United | 29 January 1977 |
| 6 | Northwich Victoria | 1–3 | Oldham Athletic | 29 January 1977 |
| 7 | Middlesbrough | 4–0 | Hereford United | 29 January 1977 |
| 8 | Swindon Town | 2–2 | Everton | 29 January 1977 |
| Replay | Everton | 2–1 | Swindon Town | 1 February 1977 |
| 9 | Ipswich Town | 2–2 | Wolverhampton Wanderers | 29 January 1977 |
| Replay | Wolverhampton Wanderers | 1–0 | Ipswich Town | 2 February 1977 |
| 10 | Newcastle United | 1–3 | Manchester City | 29 January 1977 |
| 11 | Manchester United | 1–0 | Queens Park Rangers | 29 January 1977 |
| 12 | Cardiff City | 3–2 | Wrexham | 29 January 1977 |
| 13 | Port Vale | 2–1 | Burnley | 29 January 1977 |
| 14 | Arsenal | 3–1 | Coventry City | 29 January 1977 |
| 15 | Colchester United | 1–1 | Derby County | 29 January 1977 |
| Replay | Derby County | 1–0 | Colchester United | 2 February 1977 |
| 16 | Birmingham City | 1–2 | Leeds United | 29 January 1977 |
Question:
What is the tie number when the home team is Port Vale?
Answer:
13.0