Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_17965 ( "Ensemble" text, "Gold Medals" real, "Silver Medals" real, "Bronze Medals" real, "Total Medals" real )

### Question ###
How many numbers were listed under Silver Medals for Portsmouth HS?

### Accurate SQL ###

SELECT COUNT("Silver Medals") FROM table_17965 WHERE "Ensemble" = 'Portsmouth HS'