#include <fstream>

using namespace std;

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

int n, m, tabla[21][21];
bool sum_lin[21], sum_col[21];

void citire()
{
    f >> n >> m;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++)
            f >> tabla[i][j];
}

int sumaLinie(int i)
{
    int sum = 0;
    for(int j = 1; j <= m; j++)
        sum += tabla[i][j];
    return sum;
}

int sumaColoana(int j)
{
    int sum = 0;
    for(int i = 1; i <= n; i++)
        sum += tabla[i][j];
    return sum;
}

int sumaLinieCom(int i)
{
    int sum;
    for(int j = 1; j <= m; j++)
        sum += -tabla[i][j];
    return sum;
}

int sumaColoanaCom(int j)
{
    int sum = 0;
    for(int i = 1; i <= n; i++)
        sum += -tabla[i][j];
    return sum;
}

void comutLinie(int i)
{
    for(int j = 1; j <= m; j++)
        tabla[i][j] = -tabla[i][j];
}

void comutColoana(int j)
{
    for(int i = 1; i <= n; i++)
        tabla[i][j] = -tabla[i][j];
}

void suma()
{
    int sum = 0;
    for(int i = 1; i <= n; i++)
        for(int j = 1; j <= m; j++)
            sum += tabla[i][j];
    g << sum;
}

void flippy()
{
    for(int i = 1; i <= n; i++)
        if(sumaLinie(i) > sumaLinieCom(i)) sum_lin[i] = 1;
        else sum_lin[i] = 0;
    for(int j = 1; j <= m; j++)
        if(sumaColoana(j) > sumaColoanaCom(j)) sum_col[j] = 1;
        else sum_col[j] = 0;
    for(int i = 1; i <= n; i++)
        if(!sum_lin[i]) comutLinie(i);
    for(int j = 1; j <= m; j++)
        if(!sum_col[j]) comutColoana(j);
}

int main()
{
    citire();
    flippy();
    suma();
    return 0;
}