#include <fstream>
#include <cmath>
#include <cstdio>
using namespace std;
FILE *f,*g;
int ma[16][16];
int m,n;
unsigned smax=0;

int main ()
{
    f = fopen("flip.in","r");
    g = fopen("flip.out","w");
    fscanf(f,"%d %d",&n,&m);
    for(int i = 0 ; i < n ; i++) {
        for(int j = 0 ; j < m ; j++) {
            fscanf(f,"%d",&ma[i][j]);
        }
    }
    int s1,s2;
    for(int i = 0 ; i < pow(2,n) ; i++) {
        s1 = 0;
        for(int j = 0 ; j < m ; j++) {
            s2 = 0;
            for(int k = 0 ; k < n ; k++) {
                if((i>>k)%2==1)
                    s2+=ma[k][j];
                else
                    s2-=ma[k][j];
            }
            s1 += abs(s2);
        }
        if(s1 > smax)
            smax = s1;
    }
    fprintf(g,"%d\n",smax);
    return 0;
}