Hi,
Yes it's possible but because you don't have Excel 2007 or 2010 only by using an array formula. Don't dismiss helper columns like the column H I've shown you out of hand. For users of Excel 2003 they can be particularly useful since they allow you to combine several criteria to create a single unique criteria.
You can use array formulae like SUMPRODUCT() but be aware that for anything other than small ranges these can can be memory hungry and slow calculations down. In your case the following two array formula will work.
I3:
J3:
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