Have Row & Column Number, and Sheet Name - Get Value

[dvent]

Cell A1 = Row Number
Cell A2 = Column Number
Cell A3 = Sheet Name

How do I add all of these together to get the value from a cell as you would with:

=Sheet1!A1

I'm sure this is so simple but there you go!

Thanks
dvent

[DonkeyOte]

You can use INDIRECT in either of the below forms

=INDIRECT("'"&A3&"'!R"&A1&"C"&A2,FALSE)

or

=INDIRECT(ADDRESS(A1,A2,,,A3))

[dvent]

brilliant thanks!!