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:
| Community | Area | Location | Population | Date established |
| --- | --- | --- | --- | --- |
| Beaver Lake 17 | 49.4 hectares (122 acres) | 78.4 km. southeast of Halifax | 23 | March 3, 1867 |
| Cole Harbour 30 | 18.6 hectares (46 acres) | 9.6 km. east of Halifax | 194 | March 3, 1880 |
| Millbrook 27 | 302.0 hectares (746 acres) | 8 km. south of Truro | 847 | March 3, 1886 |
| Sheet Harbour 36 | 32.7 hectares (81 acres) | 91.2 km. northeast of Halifax | 15 | March 3, 1915 |
| Truro 27A | 16.7 hectares (41 acres) | Joined south of Truro town limit | 0 | March 3, 1904 |
| Truro 27B | 16.4 hectares (41 acres) | Joined with 27A on south | 0 | March 3, 1907 |
| Truro 27C | 9.5 hectares (23 acres) | Joined with 27B on south | 0 | March 3, 1909 |
Question:
how many communities have a population of zero?
Answer:
3