SUMIFS formula that takes first seven of matching criteria from an array

Hi,

I'm trying to use a SUMIFS function with two sets of criteria;
1. the ID of an operator,
2. the 7 most recent weeks that this operator was active

Based on the example below, I essentially want to create a list in which I sum up used Resources (Column C), by a particular Operator (Column A), in the most recent 7 actions based on the week of occurence (Column B).

This has to be a dynamic formula (everything is variable) as I'm dealing with over 200 ID's and 4 more phases of which I need to sum these resources up.

I've got something like =SUMIFS(C:C,A:A,73,B:B,"<"&$A$1)
I presume I have to insert an OFFSET(...MATCH(...ROW))) somewhere in the last criteria part of this but I haven't been able to wrap my head around this (4 days non-stop spreadsheet analysis may be the cause I'm overlooking the simple solution here...)

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