#include <fstream>

using namespace std;
int n,m,v[17][17],sc[17],sl[17];
int main()
{
    ifstream in("flip.in");
    ofstream out("flip.out");
    in >> n >> m;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
            in >> v[i][j];
    for(int i=1;i<=n;i++)
    {
        int s1=0,s2=0;
        for(int j=1;j<=m;j++)
        {
            s1=s1+v[i][j];
            s2=s2-v[i][j];
        }
        if(s1<s2)
            sl[i]=1;
        else
            sl[i]=-1;

    }
    for(int i=1;i<=n;i++)
    {
        int s1=0,s2=0;
        for(int j=1;j<=m;j++)
        {
            s1=s1+v[j][i];
            s2=s2-v[j][i];
        }
        if(s1<s2)
            sc[i]=1;
        else
            sc[i]=-1;

    }
    int s=0;
    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
        {
            s=s+v[i][j]*sl[i]*sc[j];
        }

    out << s << endl;
    return 0;
}