Need Stored Procedure that adds only when matching column is true

Hello

I have 5 columns in a database with a value

val1
..
..
..
val5

and 5 matching bit columns

ValBit1
..
...
..
ValBit5


I need to sum up the values in val1 only when Valbit1 is true Val2 when Val2 is true etc etc

all returning 1 summed value

I need to do this is a stored procedure not sure how to proceed?

Thanks