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:
| Home team | Home team score | Away team | Away team score | Venue | Crowd | Date |
| --- | --- | --- | --- | --- | --- | --- |
| Fitzroy | 10.8 (68) | Melbourne | 16.14 (110) | Brunswick Street Oval | 23233.0 | 18 June 1960 |
| Essendon | 13.10 (88) | South Melbourne | 12.15 (87) | Windy Hill | 21000.0 | 18 June 1960 |
| Carlton | 18.12 (120) | North Melbourne | 8.15 (63) | Princes Park | 13897.0 | 18 June 1960 |
| St Kilda | 7.13 (55) | Hawthorn | 8.19 (67) | Junction Oval | 23900.0 | 18 June 1960 |
| Richmond | 11.17 (83) | Geelong | 12.11 (83) | Punt Road Oval | 13000.0 | 18 June 1960 |
| Footscray | 8.19 (67) | Collingwood | 10.14 (74) | Western Oval | 28098.0 | 18 June 1960 |
Question:
What is the sum of crowd(s) when north melbourne is away?
Answer:
13897.0