//#include "stdafx.h"
#include <fstream>
#include <iostream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int main()
{
	int n,m,i,j;
	long a[20][20],suma1,suma2,suma=0;
	f>>n>>m;
	for (i=0;i<n;i++)
	{
		for (j=0;j<m;j++) f>>a[i][j];
	}
	for (j=0;j<m;j++)
	{
		suma1 = suma2 = 0;
		for (i=0;i<n;i++)
		{
			suma1 += a[i][j];
			suma2 -= a[i][j];
		}
		if (suma2>suma1) 
		{
			suma += suma2;
			for (i=0;i<n;i++) a[i][j] *= -1;
		}
		else suma += suma1;
	}
	for (i=0;i<n;i++)
	{
		suma1 = suma2 = 0;
		for (j=0;j<m;j++)
		{
			suma1 += a[i][j];
			suma2 -= a[i][j];
		}
		if (suma2>suma1) suma += suma2 - suma1;
	}
	g<<suma;
	return 0;
}