Summing multiple values if various columns conform

Hi guys, just wondering if anyone can help me.

I'd like to add up the values in a certain column but only when data in the row conforms to certain criteria.

As an example, if the value in column A can be England, Scotland, Ireland or Wales, the value in column B can be Yes, No or Maybe, and the value in column C can be any number, how would I find the sum of every figure in column C that had Scotland and Yes as the values in it's row.

I hope this is clear and thanks for any help.

Or please see attacheement.
You can change the value in column B using data Validation

Thank you very much, the SUMIFS function was exactly what I was after.

Thank you very much DeWilk that table will come in very handy.