9. Lele used identical small cubic building blocks to build five "building columns" of different heights, using one block per layer. Feifei added 30 blocks to one of the "building columns" and took away half of the blocks from the other four "building columns", and found that the new five "building columns" were still the same height as before. The five "building columns" used $\qquad$ blocks in total.
$62$