#include <fstream>
 #include <limits.h>
using namespace std;
ifstream in("flip.in");
ofstream out("flip.out");
int z[20],a[20][20],n,m,smax=INT_MIN;
void flip()
{
    int suma=0,slinie=0;
    for(int i=1;i<=n;i++)
    {
       suma=0;
        for(int j=1;j<=m;j++)
            suma=suma+z[j]*a[i][j];
        if(suma<0)
          suma=suma*(-1);
        slinie=slinie+suma;
    }
    if(slinie>smax)
       smax=slinie;
}
int count=0;
void bkt(int k)
{
    if(k<=m)
    {
        z[k]=1;
        count++;
        bkt(k+1);
        z[k]=-1;
        bkt(k+1);// trebuie sa se duca la m de la toate elementele

    }
    else
      flip();
}
int main()
{
   in>>n>>m;
   for(int i=1;i<=n;i++)
      for(int j=1;j<=m;j++)
         in>>a[i][j];
   bkt(1);
   out<<smax;
   return 0;
}