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 | Darlington | 0–4 | Wolverhampton Wanderers | 14 January 1998 |
| 2 | Bournemouth | 0–1 | Huddersfield Town | 13 January 1998 |
| 3 | Liverpool | 1–3 | Coventry City | 3 January 1998 |
| 4 | Preston North End | 1–2 | Stockport County | 3 January 1998 |
| 5 | Watford | 1–1 | Sheffield Wednesday | 3 January 1998 |
| Replay | Sheffield Wednesday | 0–0 | Watford | 14 January 1998 |
| Sheffield Wednesday won 5–3 on penalties | Sheffield Wednesday won 5–3 on penalties | Sheffield Wednesday won 5–3 on penalties | Sheffield Wednesday won 5–3 on penalties | Sheffield Wednesday won 5–3 on penalties |
| 6 | Leicester City | 4–0 | Northampton Town | 3 January 1998 |
| 7 | Blackburn Rovers | 4–2 | Wigan Athletic | 3 January 1998 |
| 8 | Grimsby Town | 3–0 | Norwich City | 3 January 1998 |
| 9 | Crewe Alexandra | 1–2 | Birmingham City | 3 January 1998 |
| 10 | West Bromwich Albion | 3–1 | Stoke City | 13 January 1998 |
| 11 | Derby County | 2–0 | Southampton | 3 January 1998 |
| 12 | Everton | 0–1 | Newcastle United | 4 January 1998 |
| 13 | Swindon Town | 1–2 | Stevenage Borough | 3 January 1998 |
| 14 | Sheffield United | 1–1 | Bury | 3 January 1998 |
| Replay | Bury | 1–2 | Sheffield United | 13 January 1998 |
| 15 | Tottenham Hotspur | 3–1 | Fulham | 5 January 1998 |
| 16 | Manchester City | 2–0 | Bradford City | 3 January 1998 |
| 17 | Queens Park Rangers | 2–2 | Middlesbrough | 3 January 1998 |
| Replay | Middlesbrough | 2–0 | Queens Park Rangers | 13 January 1998 |
| 18 | Barnsley | 1–0 | Bolton Wanderers | 3 January 1998 |
| 19 | Bristol Rovers | 1–1 | Ipswich Town | 3 January 1998 |
| Replay | Ipswich Town | 1–0 | Bristol Rovers | 13 January 1998 |
| 20 | Portsmouth | 2–2 | Aston Villa | 3 January 1998 |
| Replay | Aston Villa | 1–0 | Portsmouth | 14 January 1998 |
| 21 | West Ham United | 2–1 | Emley | 3 January 1998 |
| 22 | Crystal Palace | 2–0 | Scunthorpe United | 3 January 1998 |
| 23 | Chelsea | 3–5 | Manchester United | 4 January 1998 |
| 24 | Wimbledon | 0–0 | Wrexham | 4 January 1998 |
| Replay | Wrexham | 2–3 | Wimbledon | 13 January 1998 |
| 25 | Cardiff City | 1–0 | Oldham Athletic | 3 January 1998 |
| 26 | Charlton Athletic | 4–1 | Nottingham Forest | 3 January 1998 |
| 27 | Arsenal | 0–0 | Port Vale | 3 January 1998 |
| Replay | Port Vale | 1–1 | Arsenal | 14 January 1998 |
| Arsenal won 4–3 on penalties | Arsenal won 4–3 on penalties | Arsenal won 4–3 on penalties | Arsenal won 4–3 on penalties | Arsenal won 4–3 on penalties |
| 28 | Cheltenham Town | 1–1 | Reading | 13 January 1998 |
| Replay | Reading | 2–1 | Cheltenham Town | 20 January 1998 |
| 29 | Leeds United | 4–0 | Oxford United | 3 January 1998 |
| 30 | Hereford United | 0–3 | Tranmere Rovers | 13 January 1998 |
| 31 | Rotherham United | 1–5 | Sunderland | 3 January 1998 |
| 32 | Peterborough United | 0–2 | Walsall | 13 January 1998 |
Question:
what is the tie number that has Portsmouth Home team
Answer:
20.0