# include <bits/stdc++.h>

using namespace std;

const int Nmax = 17;

int N, M, i, j, a[Nmax][Nmax], sum, sum_c, res;

int main ()
{
    freopen("flip.in","r",stdin);
    freopen("flip.out","w",stdout);

    scanf("%d %d\n", &N, &M);

    for (i = 1; i <= N; ++i)
        for (j = 1; j <= M; ++j)
            scanf("%d", &a[i][j]);

    for (int i = 1; i < (1 << M); ++i) {
        sum = 0;
        for (int I = 1; I <= N; ++I){
            sum_c = 0;
            for (int J = 0; J < M; ++J){
                if (i & (1 << J)) sum_c -= a[I][J + 1];
                    else sum_c += a[I][J + 1];
            }
            sum += abs(sum_c);
        }
        res = max(res, sum);
    }

    printf("%d\n", res);

    return 0;
}