#include<stdio.h>

long a[20][20];
long long s;
int w[20],n,m;

void citire()
{
freopen("flip.in","r",stdin);
scanf("%d%d", &n, &m);
for (int i=0; i<n; i++)
    for (int j=0; j<m; j++)
	scanf("%ld", &a[i][j]);
fclose(stdout);
}     

void verificare()
{
int q,e=0;     
for (int j=0; j<m; j++)     
    {
    q=0;
    for (int i=0; i<n; i++)
	q+=a[i][j]*w[i];
    if (q<0)
       q*=-1;
    e+=q;
    }
if (e>s)
   s=e; 
}     

void back(int k)
{
if (k>n-1)
    verificare();
    else {
	 for (int i=0; i<=1; i++)
             {
             if (i==1)     
                 w[k]=i;
                 else w[k]=-1;
             back(k+1);
             }
         }
}     

void afisare()
{
freopen("flip.out","w",stdout);
printf("%lld",s);
fclose(stdout);
}

int main()
{
citire();    
s=-2000000;
back(0);
afisare();
return 0;
}