Count same occurrences in different fields

[isantiago926]

I'd like to know ho I can compute a count of the same names or codes between different fields.
For example, I have 4 fields each with different region names.
I'd like to have a field counting all equal occurrences comparing all fields.
If f1="X",f2="X",f 3="X",f4="X"
then CountField = 4

[NeoPa]

And what if F1='X', F2='Y', F3='Y' & F4='Z'?

Please express your requirement precisely.