Hello
I need help ading a range of columns if it meets 2 criteria.

I need a formula that will add number found for example in column C D E If it meets 2 citeria on A&B
Example
A B C D E
3/15/2013 Colorado 2 4 1
3/15/2013 KS 1 5 0
3/16/2013 Colorado 9 1 2


Answer in this case would be:
3/15/2013 Colorado 7

Basically I need a formula that will add across if it meets 2 criteria.
Thank you