#include <iostream>
#include <cstdio>
#include <cstdlib>
using namespace std;

int n,m;
int tab[17][17];

int main()
{
    int sl=-200000,sum,rez,tot=0,i,j,maxim;
    freopen("flip.in","r",stdin);
    freopen("flip.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++) scanf("%d",&tab[i][j]);
    maxim=1<<m;
    for(rez=1;rez<maxim;rez++)
    {
        sum=0;
        for(i=1;i<=n;i++)
        {
            tot=0;
            for(j=1;j<=m;j++)
                if(rez& (1<<j) ) tot-=tab[i][j];
                          else tot+=tab[i][j];
            sum+=abs(tot);
        }
        if(sum>sl) sl=sum;
    }
    printf("%d\n",sl);
    fclose(stdin);
    fclose(stdout);
    return 0;
}