#include <stdio.h>
using namespace std;
int K[20],n,m;
long T[20][20],S;

void citire()
{
 FILE *fin=fopen("flip.in","r");
 fscanf(fin,"%d%d",&n,&m);
 for (int i=1;i<=n;i++)
  for (int j=1;j<=m;j++)
   fscanf(fin,"%ld",&T[i][j]);
 fclose(fin);
}

void cauta_sol()
{
 long s,total=0;
 for (short i=1;i<=n;i++)
  {
   s=0;
   for (short j=1;j<=m;j++)
    s+=(T[i][j]*K[j]);
   if (s<0) s*=-1;
   total+=s;
  }
 if (S<total)S=total;
}

void generare(int i)
{
 if (i>m) cauta_sol();
    else
     {
      K[i]=1; generare(i+1);
      K[i]=-1;generare(i+1);
     }
}

void afisare()
{
 FILE *fout=fopen("flip.out","w");
 fprintf(fout,"%ld\n",S);
 fclose(fout);
}

int main()
{
 citire();
 S=-1000000;
 generare(1);
 afisare();
 return 0;
}