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_15 ( wins INTEGER, events VARCHAR, top_5 VARCHAR )

### Question ###
what is the sum of wins when events is 13 and top-5 is less than 1?

### Accurate SQL ###

SELECT SUM(wins) FROM table_name_15 WHERE events = 13 AND top_5 < 1