InfoPath Dev

Hi There

 I was never good in math cant seam to get this to work, i have a 4 fields, and have a total one, the total one will equal something like this 

(field1 * .5) + (field2 * .6) + (field3 * .3) + (field4 *5)

that together would equal my total text box, what am i doing wrong?
 

Silly me you have to add the hole thing in () so it looked like ((field1 * .5) + (field2 * .6) + (field3 * .3) + (field4 *5)) that worked just thought i would let everyone know.. :)