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 | Blackpool | 0–1 | Chelsea | 15 January 1972 |
| 2 | Burnley | 0–1 | Huddersfield Town | 15 January 1972 |
| 3 | Bury | 1–1 | Rotherham United | 15 January 1972 |
| Replay | Rotherham United | 2–1 | Bury | 24 January 1972 |
| 4 | Preston North End | 4–2 | Bristol City | 15 January 1972 |
| 5 | Southampton | 1–1 | Manchester United | 15 January 1972 |
| Replay | Manchester United | 4–1 | Southampton | 19 January 1972 |
| 6 | Watford | 1–4 | Notts County | 15 January 1972 |
| 7 | Walsall | 1–0 | A.F.C. Bournemouth | 15 January 1972 |
| 8 | Bolton Wanderers | 2–1 | Torquay United | 15 January 1972 |
| 9 | Wolverhampton Wanderers | 1–1 | Leicester City | 15 January 1972 |
| Replay | Leicester City | 2–0 | Wolverhampton Wanderers | 19 January 1972 |
| 10 | West Bromwich Albion | 1–2 | Coventry City | 15 January 1972 |
| 11 | Sunderland | 3–0 | Sheffield Wednesday | 15 January 1972 |
| 12 | Derby County | 2–0 | Shrewsbury Town | 15 January 1972 |
| 13 | Swindon Town | 0–2 | Arsenal | 15 January 1972 |
| 14 | Sheffield United | 1–3 | Cardiff City | 15 January 1972 |
| 15 | Newcastle United | 2–2 | Hereford United | 24 January 1972 |
| Replay | Hereford United | 2–1 | Newcastle United | 5 February 1972 |
| 16 | Tottenham Hotspur | 1–1 | Carlisle United | 15 January 1972 |
| Replay | Carlisle United | 1–3 | Tottenham Hotspur | 18 January 1972 |
| 17 | Manchester City | 1–1 | Middlesbrough | 15 January 1972 |
| Replay | Middlesbrough | 1–0 | Manchester City | 18 January 1972 |
| 18 | Queens Park Rangers | 1–1 | Fulham | 15 January 1972 |
| Replay | Fulham | 2–1 | Queens Park Rangers | 18 January 1972 |
| 19 | West Ham United | 2–1 | Luton Town | 15 January 1972 |
| 20 | Norwich City | 0–3 | Hull City | 15 January 1972 |
| 21 | Millwall | 3–1 | Nottingham Forest | 15 January 1972 |
| 22 | Crystal Palace | 2–2 | Everton | 15 January 1972 |
| Replay | Everton | 3–2 | Crystal Palace | 18 January 1972 |
| 23 | Blyth Spartans | 2–2 | Reading | 15 January 1972 |
| Replay | Reading | 6–1 | Blyth Spartans | 19 January 1972 |
| 24 | Charlton Athletic | 0–0 | Tranmere Rovers | 15 January 1972 |
| Replay | Tranmere Rovers | 4–2 | Charlton Athletic | 17 January 1972 |
| 25 | Leeds United | 4–1 | Bristol Rovers | 15 January 1972 |
| 26 | Stoke City | 2–1 | Chesterfield | 15 January 1972 |
| 27 | Boston United | 0–1 | Portsmouth | 15 January 1972 |
| 28 | Peterborough United | 0–2 | Ipswich Town | 15 January 1972 |
| 29 | Birmingham City | 3–0 | Port Vale | 15 January 1972 |
| 30 | Oxford United | 0–3 | Liverpool | 15 January 1972 |
| 31 | Orient | 3–0 | Wrexham | 15 January 1972 |
| 32 | Swansea City | 1–0 | Gillingham | 15 January 1972 |
Question:
What is the tie number for the home team Orient?
Answer:
31.0