# include <fstream>
using namespace std;
ifstream in("flip.in");
ofstream out("flip.out");
int v[17][17],maxi=-1999999999,n,m;
int p[17];
void calc()
{
    int i,t=0,j,s=0;
    for (j=1; j<=m; j++)
    {
        s=0;
        for (i=1;i<=n;i++)
        {
            if (p[i]==0)
            {
                s+=v[i][j];
            }
            else
            {
                s-=v[i][j];
            }
        }
        if (s<0){s=-s;}
        t+=s;
    }
    if (t>maxi)
    {
        maxi=t;
    }
}
void rez(int k)
{
    if (k==n+1) calc();
    else
    {
        p[k]=0;
        rez(k+1);
        p[k]=1;
        rez(k+1);
    }
}
int main()
{
    int i,j;
    in>>n>>m;
    for (i=1;i<=n;i++) for (j=1;j<=m;j++) in>>v[i][j];
    rez(1);
    out<<maxi;
    return 0;
}