#include <bits/stdc++.h>

using namespace std;
ifstream fin("flip.in");
ofstream fout("flip.out");

const int NMMAX = 16;

int a[NMMAX][NMMAX];
int main()
{
    int n, m;
    fin >> n >> m;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            fin >> a[i][j];
        }
    }
    int smax = 0;
    for (int mask = 0; mask < (1 << m); mask++) {
        int sum = 0;
        for (int i = 0; i < n; i++) {
            int slin = 0;
            for (int j = 0; j < m; j++) {
                if (mask & (1 << j)) slin -= a[i][j];
                else slin += a[i][j];
            }
            sum += abs(slin);
        }
        smax = max(smax, sum);
    }
    fout << smax;
    return 0;
}