#include<fstream>
#define In "flip.in"
#define Out "flip.out"
#define oo 17000000
using namespace std;
int a[20][20],v[20], n, m,maxx;
void Citire()
{
    ifstream fin(In);
    fin>>n>>m;
    int i,j;
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++)
            fin>>a[i][j];
    fin.close();
}

void Rez()
{
    int sum = 0 ,s,i,j;
    for(i=1;i<=n;i++)
    {
        s = 0;
        for(j=1;j<=m;j++)
            s = s + a[i][j] * v[j];
        if(s<0) s*=(-1);
        sum += s;
    }
    if(sum>maxx)
        maxx = sum;
}

void Bkt(int k)
{
    if(k==m+1)
    {
        Rez();
        return ;
    }
    v[k] = 1;
    Bkt(k+1);
    v[k] = -1;
    Bkt(k+1);
}

void Afisare()
{
    ofstream fout(Out);
    fout<<maxx<<"\n";
    fout.close();
}

int main()
{
    Citire();
    maxx =-oo;
    Bkt(1);
    Afisare();
    return 0;
}