#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int n,m;
long long a[20][20],i,j,val[20],sumx,sum,s,k;
void bkt(int k)
{
    if(k>m)
    {
        for(i=1;i<=n;i++)
        {
            s=0;
            for(j=1;j<=m;j++)
                s=s+a[i][j]*val[j];
            if(s<0)s=s*(-1);
            sum=sum+s;
        }
        if(sum>sumx)sumx=sum;
    }else
    {val[j]=1;
     bkt(k+1);
     val[j]=-1;
     bkt(k+1);
    }
}
int main()
{
    f>>n>>m;
    for(i=1;i<=n;i++)
        for(j=1;j<=m;j++)
        f>>a[i][j];
    bkt(1);
    g<<sumx;
}