#include <fstream>
#include <cmath>
using namespace std;
#define getmax(a,b) ((a)>(b)?(a):(b))

ifstream cin("flip.in");
ofstream cout("flip.out");

int n, m;
int v[17][17];
int calcSum(int NrPerm) {
	int Sum = 0;
	for (int i = 1; i <= n; i++) {
		int SumLin = 0;
		for (int j = 1; j <= m; j++)
			if (NrPerm & (1 << (j - 1)))
				SumLin += v[i][j];
			else
				SumLin -= v[i][j];
		Sum += abs(SumLin);
	}
	return Sum;
}

int main() {
	cin >> n >> m;
	for (int i = 1; i <= n; i++)
		for (int j = 1; j <= m; j++)
			cin >> v[i][j];
	int sol = 0;
	for (int i = 0; i < (1 << m); i++)
		sol = getmax (sol, calcSum(i));
	cout << sol;
	return 0;
}