module Main;

import CPLib.IO;

main : IO () = (
    let n = *read_i;
    let m = *read_i;
    // iが宝箱、jが宝石
    let aij = fill(n, fill(m, 0));
    let aij = *range(0, n).fold_m(aij, |i, aij|
        range(0, m).fold_m(aij, |j, aij|
            let a = *read_i;
            let aij = aij[i][j].iset(a);
            aij.pure
        )
    );
    let jewel_num = fill(m, 0);
    let jewel_num = range(0, n).fold(jewel_num, |i, jewel_num|
        range(0, m).fold(jewel_num, |j, jewel_num|
            let a = aij[i][j].iget;
            jewel_num[j].imod(add(a))
        )
    );
    let gain = fill(n, 0);
    let gain = range(0, n).fold(gain, |i, gain|
        range(0, m).fold(gain, |j, gain|
            let a = aij[i][j].iget;
            gain[i].imod(add(a * jewel_num[j].iget))
        )
    );
    let gain = gain.sort;
    let y = range(0, n/2).map(|i| gain.@(2*i)).sum;
    let x = range(0, n/2).map(|i| gain.@(2*i+1)).sum;
    let ans = x - y;
    ans.to_string.println;;
    pure()
);