Maths problem - A MT. TBR Update

I spent the last three days in London.

During my trip I managed to read/finish two books of my Mt. TBR.



However, as it was London - the location of my favourite book shop - I came home with six new books. Six!

That increases Mt. TBR by four books and a major elevation of guilt.



The new book haul titles are the six from the top: