#include <fstream>

using namespace std;

ifstream f("flip.in");
ofstream g("flip.out");

int n, m, sum = 0;
int a[17][17];
int x[17];

void Sum();

void det(int k);

int main()
{
    f >> n >> m;
    for ( int i = 1; i <= n; i++ )
        for ( int j = 1; j <= m; j++)
            f >> a[i][j];
        det(1);
        g << sum;
        f.close();
        g.close();
        return 0;
}
void Sum()
{
   int s = 0, s1 = 0;
    for ( int i = 1; i <= m; i++ )
    {
        s = 0;
        for ( int j = 1; j <= n; j++)
            s += (a[j][i] * x[j]);
        if( s < 0 )
            s = s *(-1);
        s1 += s;
    }
    if( sum < s1)
        sum = s1;
}
void det(int k)
{
    if( k == n+1 )
        Sum();
    else
        for( int i = -1; i <= 1 ; i += 2 )
        {
            x[k] = i;
            det(k + 1);
        }
}