#include<fstream>
using namespace std;

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

int i,j,n,m,sum,a[20][20],x[20];


int suma()
{
    int i,j,s,s1=0;
    for(j=1;j<=m;j++)
    {
        s=0;
        for(i=1;i<=n;i++)
            s+=(a[i][j]*x[i]);
        if(s<0) s=s*-1;
        s1+=s;
    }
    return s1;

}
void op(int k)
{ int i,ss;
    if(k==n+1)
        {ss=suma();if(sum<ss) sum=ss;}
    else
        for(i=-1;i<=1;i+=2)
        {
            x[k]=i;
            op(k+1);
        }
}
int main()
{


    fin>>n>>m;
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++)
            fin>>a[i][j];
        op(1);
        fout<<sum;
        return 0;
}