If then else in excel

[nfak]

I wish to do the following:
If cell X in column A=P and cell Y in column B=Q, then increase count.
How can I do this using formulas?

 

[Bob Phillips]

Where is the counter, one of these cells, or some other?

--
HTH

Bob

(there's no email, no snail mail, but somewhere should be gmail in my addy)