#include <fstream>

using namespace std;

int main()
{
    ifstream fin("flip.in");
    ofstream fout("flip.out");
    int N,M,v[17][17],s=0,i,j,s1,l;
    fin>>N>>M;
    v[0][0]=0;
    for(i=1;i<=N;i++)
    {
        s1=0;
        for(j=1;j<=M;j++)
        {
            fin>>v[i][j];
            s1+=v[i][j];
        }
        if(s1<0)
        {
            v[i][0]=-s1;
            for(l=1;l<=M;l++)
                {
                    v[i][l]*=-1;
                }
        }
        else
             v[i][0]=s1;
    }
    for(j=1;j<=M;j++)
    {
        s1=0;
        for(i=1;i<=N;i++)
        {
            fin>>v[i][j];
            s1+=v[i][j];
        }
        if(s1<0)
        {
            v[0][j]=-s1;
            for(l=1;l<=N;l++)
            {
                v[l][j]=-v[l][j];
                v[l][0]+=v[l][j]+v[l][j];
            }
        }
        else
            v[0][j]=s1;
    }
    s=0;
         for(j=1;j<=M;j++)
            s+=v[0][j];
    fout<<s;
    return 0;
}