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_23388 ( "Team & Boat name" text, "Sail no." text, "Flag" text, "Design Firm" text, "Builder" text, "Skipper" text )

### Question ###
Farr Yacht Design designed boats for how many country/flags?

### Accurate SQL ###

SELECT COUNT("Flag") FROM table_23388 WHERE "Design Firm" = 'Farr Yacht Design'