CF662C Binary Table

You are given a table consisting of $ n $ rows and $ m $ columns. Each cell of the table contains either $ 0 $ or $ 1 $ . In one move, you are allowed to pick any row or any column and invert all values, that is, replace $ 0 $ by $ 1 $ and vice versa. What is the minimum number of cells with value 1 you can get after applying some number of operations?

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