#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("flip.in");
ofstream fout("flip.out");

int N, M;
int A[20][20];
int X[20];
int MSum;

void Read()
{
	fin >> N >> M;

	for (int i = 1; i <= N; i++)
		for (int j = 1; j <= M; j++)
			fin >> A[i][j];
}

void Solve()
{
	int Sum = 0;

	for (int j = 1; j <= M; j++)
	{
		int s = 0;
		for (int i = 1; i <= N; i++)
			s += A[i][j] * X[i];
		if (s < 0)
			s *= -1;
		Sum += s;
	}
	if (Sum > MSum) {
		MSum = Sum;
	}
}

void Back(int l)
{
	for (int i = -1; i <= 1; i += 2)
	{
		X[l] = i;
		if (l == N)
			Solve();
		else
			Back(l + 1);
	}
}

int main()
{
	Read();
	Back(1);
	fout << MSum;
	return 0;
}