I am recording the customers that come to my shop everyday.

I make the record everyday on one sheet. So I end up having a number of sheets like this.
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And I have a summary page like this.
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Here's what I want to do, sum up the total of customers according to weekdays, both male and female.
e.g. No. of customers on Mondays in June

I know that probably involves sumproduct and indirect, but somehow I didn't know how to do sum up multiple sheets.

Please help!!
Thank you.