#include <fstream>
using namespace std;

ifstream cin ("flip.in");
ofstream cout ("flip.out");
int a[20][20], s, smax=-2000000000, n, m, v[20];

int sumacol(int j)
{
    int scol = 0;
    for(int i = 1; i <= n; i++)
        scol += v[i] * a[i][j];
    return scol;
}

void backtr(int poz)
{
    if(poz == n + 1)
    {
        int stotal = 0;
        for(int i = 1; i <= m; i++)
            stotal = stotal + abs(sumacol(i));
        if(stotal > smax)
            smax = stotal;
        return;
    }
    v[poz] = 1;
    backtr(poz + 1);
    v[poz] = -1;
    backtr(poz + 1);

}

int main()
{
    cin>>n>>m;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++)
            cin>>a[i][j];
    backtr(1);
    cout<<smax;
    return 0;
}