#include <fstream>

using namespace std;

ifstream fin("flip.in");
ofstream fout("flip.out");

int n,m,i,j,sum,sl,maxim,a[20][20];
bool ok,v[20];

int main()
{
    fin >> n >> m;
    maxim=-2000000005;
    for (i=1;i<=n;i++) for (j=1;j<=m;j++) fin >> a[i][j];
    while (ok==0)
    {
        i=n;
        while (v[i]==1)
        {
            v[i]=0;
            i--;
        }
        v[i]=1;
        sum=0;
        for (j=1;j<=m;j++)
        {
            sl=0;
            for (i=1;i<=n;i++) if (v[i]==0) sl+=a[i][j];
            else sl-=a[i][j];
            if (sl<0) sl*=-1;
            sum+=sl;
        }
        if (sum>maxim) maxim=sum;
        if (v[0]==1) ok=1;
    }
    fout << maxim;

    return 0;
}