#include <stdio.h>
#include <stdlib.h>

int m,n,x[16];
long max=-2147483648,mat[16][16];

int back(int k)
{
int i,j;
long s=0,l;
if (k<m)
  {
    x[k]=1;
    back(k+1);
    x[k]=-x[k];
    back(k+1);

  }
else if (k==m)
{
    s=0;
    for (i=0;i<n;i++)
      {
      l=0;
      for(j=0;j<m;j++)
	l+=mat[i][j]*x[j];
      s+=abs(l);
      }

    if (s>max)
      max=s;

}

return 0;
}




int main()
{
int i,j;
FILE *f;
f=fopen("flip.in","r");
fscanf(f,"%d",&n);
fscanf(f,"%d",&m);
for (i=0;i<n;i++)
  for (j=0;j<m;j++)
    fscanf(f,"%ld",&mat[i][j]);
fclose(f);


back(0);

f=fopen("flip.out","w");
fprintf(f,"%ld",max);
fclose(f);


return 0;
}