Special Operation

You are given a matrix $A$ consisting of $N$ rows and $M$ columns. You task is to select an element $A_{(x, y)}$ $(1 \le x \le N, 1 \le y \le M)$ such that the following value is **maximised**: - $\sum_{i = 1, i\neq x}^{i = N} \sum_{j = 1, j\neq y}^{j = M} (A_{(i, j)} \oplus A_{(x, y)})$. Here, $\oplus$ denotes [bitwise XOR](https://en.wikipedia.org/wiki/Bitwise_operation#XOR) operation. In oth