#include <iostream>
#include <fstream>
using namespace std;

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

int n, m, a[17][17], suma, sumamax, x[50];

void citire()
{
    fin >> n >> m;
    for(int i=1; i<=n; i++)
        for(int j=1; j<=m; j++)
            fin >> a[i][j];
}

void calculeaza()
{
    int s;
    for(int i=1; i<=n; i++)
    {
        s=0;
        for(int j=1; j<=m; j++)
        {
            s += a[i][j] * x[j];
        }
        if(s<0)
            suma-=s;
        else suma+=s;
    }
}

void bkt(int k)
{
    if(k>m)
    {
        suma = 0;
        calculeaza();
        if(suma > sumamax)
            sumamax=suma;
    }
    else for(int i=0; i<=1; i++)
    {
        x[k] = (i==0?-1:1);
        bkt(k+1);
    }
}

int main()
{
    citire();

    bkt(1);
    fout << sumamax;

    return 0;
}