Query to get Count of 2 different columns and then Sum their values in SQL Server

I WAS CREATING A FUNCTION IN SQL 2005

i want to count 'YO' in YO field 

i want to count 'YO' in RMK field

and then add both value together (eg if YO count value=5 and rmk YO count value=2 then i want 5+2=7) 

i tried the + but gives error in my query

select @Count = COUNT(*) from COURSE_intake where YO in ('YO') + RMK LIKE 'YO%' and ENTRY_COURSE = @ENTRY_COURSE