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_name_58 ( erp_w VARCHAR, class VARCHAR, frequency_mhz VARCHAR )

### Question ###
What is the total erp w of class c3, which has a frequency mhz less than 89.9?

### Accurate SQL ###

SELECT COUNT(erp_w) FROM table_name_58 WHERE class = "c3" AND frequency_mhz < 89.9