#include <iostream>
#include <fstream>
#include <stdlib.h>
using namespace std;

ifstream f("flip.in");
ofstream g("flip.out");

int a[1000][1000],sumaTotala = 0,semn[20],ocupat[20],m,n,maxim = 0,b[20];

void BK(int k)
{
    if(k > m)
    {
        maxim = 0;
        for(int i = 1;i <= n;i++)
            {
                int suma = 0;
                for(int j = 1;j <= m;j++)
                    suma += a[i][j] * semn[j];
                maxim = maxim + abs(suma);
            }
            if(maxim > sumaTotala)
                sumaTotala = maxim;
    }
    else
    {
        semn[k] = 1;
        BK(k+1);
        semn[k] = -1;
        BK(k+1);
    }
}


int main()
{
    f>>n>>m;
    for(int i = 1;i <= n;i++)
        for(int j = 1;j <= m;j++)
            f>>a[i][j];

    BK(1);
    g<<sumaTotala;
    return 0;
}