#include <fstream>
#include <cstdlib>


using namespace std;
int a[20][20], s[20], maxi, n, m;

int maxim(int a, int b) {
	if (a > b)
		return a;
	return b;
}

void calcul()
{
	int Su = 0;
	for (int j = 1; j <= m; j++)
	{
		int sumc = 0;
		for (int i = 1; i <= n; i++)
			sumc += a[i][j] * s[i];
		sumc = abs(sumc);
		Su += sumc;
		maxi = maxim(maxi, Su);

	}
}
void Back(int poz)
{
	if (poz == n + 1) calcul();
	else
	{
		s[poz] = 1;
		Back(poz + 1);
		s[poz] = -1;
		Back(poz + 1);
	}
}
int main()
{
	ifstream f("flip.in");
	ofstream g("flip.out");
	f >> n >> m;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++)
			f >> a[i][j];
	Back(1);
	g << maxi;
	return 0;
}