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:
| Courthouse | City | Street address | Jurisdiction | Dates of use | Named for |
| --- | --- | --- | --- | --- | --- |
| U.S. Post Office and Court House | Brattleboro | ? | D. Vt. | 1917–present | n/a |
| U.S. Post Office and Court House | Burlington | 175 Main Street | D. Vt. | 1870–1982\nDestroyed by fire in 1982. | n/a |
| Federal Building, Post Office and Court House | Burlington | 11 Elmwood Avenue | D. Vt. | 1958-present | n/a |
| U.S. Post Office and Court House | Montpelier | ? | D. Vt. | 1894-1948\nrazed ca. 1963 | n/a |
| Federal Building | Montpelier | State Street | D. Vt. | 1964–1996\nStill in use as a post office. | n/a |
| U.S. Court House, Post Office, and Custom House† | Newport | ? | D. Vt. | 1904–1948\nNow the Orleans County District Court. | n/a |
| U.S. Court House and Post Office | Rutland | 10 Court Street | D. Vt. | 1859–1933\nNow the Rutland Free Library. | n/a |
| U.S. Court House and Post Office | Rutland | ? | D. Vt. | 1933–present | n/a |
| U.S. Court House and Post Office | Windsor | 57 Main St. | D. Vt. | 1858–Present\nStill in use as a post office. | n/a |
Question:
what is the number of u.s. courthouse and post offices now used as free library according to the dates of use in the table?
Answer:
1