#include <iostream>
#include <fstream>

using namespace std;

ifstream f("flip.in");
ofstream g("flip.out");

int main()
{
    int m,n,suma,mat[17][17],i,j,raspuns=0,temprasp=-1;
    bool found = false;

    f>>n>>m;

    for (i=1;i<=n;i++)
    {
        for (j=1;j<=m;j++)
        {
            f>>mat[i][j];
        }
    }
    while(found == false)
    {
        cout<<"a";
        temprasp=raspuns;
        raspuns = 0;
        for (i=1;i<=m;i++)
        {
            suma=0;
            for (j=1;j<=n;j++)
            {
                suma+=mat[j][i];
            }
            if (suma<0)
            {
                for (j=1;j<=n;j++)
                {
                    mat[j][i]=-mat[j][i];
                }
            }
        }

        for (j=1;j<=n;j++)
        {
            suma=0;
            for (i=1;i<=m;i++)
            {
                suma+=mat[j][i];
            }
            if (suma<0)
            {
                for (i=1;i<=m;i++)
                {
                    mat[j][i]=-mat[j][i];
                }
            }
        }

        for (i=1;i<=n;i++)
        {
            for(j=1;j<=m;j++)
            {
                raspuns += mat[i][j];
            }
        }

        cout<<raspuns<<"  "<<temprasp<<"\n";

        if (raspuns == temprasp)
            found = true;
    }

    g<<raspuns;

    return 0;
}