#include <fstream>

using namespace std;

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

#define N 17

int a[N][N], n, m, sol=-999999999, v[N];

void citire();
void backtrack(int k);

int main()
{
    citire();
    backtrack(1);
    out << sol;

    in.close();
    out.close();
    return 0;
}

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

void backtrack(int k)
{
    if(k-1==m)
    {
        int s, ss=0;
        for(int i=1;i<=n;i++)
        {
            s=0;
            for(int j=1;j<=m;j++)
                s+=a[i][j]*v[j];
            if(s<0)
                s*=-1;
            ss+=s;
        }

        if(ss>sol)
            sol=ss;
        return;
    }
    for(int i=-1;i<=1;i+=2)
    {
        v[k]=i;
        backtrack(k+1);
    }
}