#include<fstream>
#define NMAX 20
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");

int a[NMAX][NMAX], v[NMAX], n, m, maxim = -1;

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

    if(suma>maxim) maxim=suma;
}
int back(int k)
{
    if(k>m) parcurge_matrice();
    else
		for(int i =-1; i<=1; i+=2){ v[k] = i; back(k+1); }
    
}
int main()
{
    f>>n>>m;
    for(int i =0; i<n; ++i)
        for(int j=0; j<m; ++j)
            f>>a[i][j];
    back(1);
    g<<maxim<<'\n';
    g.close();
    return 0;
}