Formula to get totals from pivot table

[mahmed1]

Hi All

I have a table that is set up like this etc


2017 2018
Jan Feb Mar Jan Feb Mar
Test1 5
Test2 10
Test3 20

This table has data stored every month with the amount of tests done

I have a pivot table that just filters to give me which months and years are selected from a slicer in this format (Ignore the values)

Count of Question	Month
Year	Jan	Apr
2018	32	89

<tbody>
</tbody><colgroup><col><col><col></colgroup>

I need a formula that looks up my table and gives me the total amount of tests done for that selection

so on my slicer - if I selected 2017, 2018 and I selected Jan and Feb

I want to retrieve the total tests done from this table

Can someone please help me with this

Thanks