excel - how to use value in cell to count up to a number -

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i need formula. have spreadsheet user enters integer in 1 cell. need use value place formula in cell. so, example, user enters 24 in cell. need place simple sum formula in 24th cell of row left , highlight red. there way this?

you put sum formula in if() function true when row = value in cell:

=if(row()=$e$2,$e$3-sum($b$1:$b1),"")

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