Total of amount in custom profilefield on forum

[993ti]

Maybe simple but no idea how i should do this.
I want to create a custom profilefield where members can enter a number.
Example: how many cars do you own?
Member A enters 2
Member B enters 3

I want to show the total amount (in this case 5) on various places of the board like header or in the statistics and would also like it to show in one of the VBadvanced CMPS blocks.
How to accomplish this?

Thanks in advance.