#include <bits/stdc++.h>

using namespace std;

ifstream fin("flip.in");
ofstream fout("flip.out");
int n, m, k, i, j, a[17][17], rasp, sumCur;

int main() {
    fin >> n >> m;
    for(i = 1; i <= n; i++) {
        for(j = 1; j <= m; j++) fin >> a[i][j];
    }

    for(k = 1; k < (1 << m); k++) {
        sumCur = 0;

        for(int i = 1; i <= n; i++) {
            int sum = 0;

            for(int j = 0; j < m; j++) {
                if(k >> j & 1) sum += a[i][j + 1];
                else           sum -= a[i][j + 1];
            }
            sumCur += (sum < 0 ? -sum : sum);
        }
        rasp = max(rasp, sumCur);
    }
    fout << rasp;

    return 0;
}