// ConsoleApplication1.cpp : This file contains the 'main' function. Program execution begins and ends there.
//

#include <iostream>
#include <cstdio>
#include <memory>
#include <string>

using namespace std;

int A[16][16];
int B[16][16];

int sums[16];
int n, m;

int abs(int x)
{
	return (x > 0) ? x : -x;
}

void read()
{
	cin >> n >> m;
	for (int i = 0; i < n; ++i)
	{
		for (int j = 0; j < m; ++j)
			cin >> A[i][j];
	}
}

void initB(int x)
{
	for (int i = 0; i < n; ++i)
	{
		for (int j = 0; j < m; ++j)
		{
			int flipCol = ((1 << j) & x) ? (-1) : 1;
			B[i][j] = A[i][j] * flipCol;
		}
	}
}

int bestSum()
{
	int sum = 0;
	for (int i = 0; i < n; ++i)
	{
		int sumLine = 0;
		for (int j = 0; j < m; ++j)
		{
			sumLine += B[i][j];
		}
		sum += abs(sumLine);
	}
	return sum;
}

int maxSum()
{
	int maxim = -(1 << 30);
	for (int i = 0; i < 1 << m; ++i)
	{
		initB(i);
		int candidate = bestSum();
		if (candidate > maxim)
			maxim = candidate;
	}
		
	return maxim;
}


int main()
{
	freopen("flip.in", "r", stdin);
	freopen("flip.out", "w", stdout);

	read();
	cout << maxSum();

	return 0;
}