Acrobat Pro value Calculations

I am wanting to assign a value ($36.00) to a name if placed in one to five fields and add the total. Example: Field 1 = John, Field 2 = Left Blank, Field 3 = Paul, Field 4 = Pam, Field five left Blank. The there with names would be $26.00 each and so the sum of the five fields would be 3 x $36.00 = $108.00.

Any and all assistance would be grateful.

Dallas Mark