#include <fstream>
using namespace std;
ifstream cin("flip.in");
ofstream cout("flip.out");
int n, m, x, a[20][20], v[50], b;
void calcul(int k)
{
	int i, j, l = 0;;
	for (j = 1; j <= m; j++)
	{
		int s = 0;
		for (i = 1; i <= n; i++)
			s = s + v[i] * a[i][j];
		if (s<0)s = -s;
		l = l + s;
	}
	if (l > x)x = l;
}
void BK(int k)
{
	for (int i = -1; i <= 1; i = i + 2)
	{
		v[k] = i;
		if (k == n)calcul(k);
		else BK(k + 1);
	}
}
int main()
{
	int i, j;
	cin >> n >> m;
	for (i = 1; i <= n; i++)
	for (j = 1; j <= m; j++)
		cin >> a[i][j];
	BK(1);
	cout << x;
	return 0;
}