#include <fstream.h>

int main() {
    int s[16][16], n, m, s1 = 0, s2 = 0, i, y, suma = 0;
    ifstream f("flip.in");
    ofstream fout("flip.out");
    f>>n>>m;
    for (i = 0; i < n; i++) {
        for (y = 0; y < m; y++) {
            f>>s[i][y];
            s1 += s[i][y];
            s2 += -s[i][y];
            }
        if (s2 > s1)
           for (y = 0; y < m; y++)
               s[i][y] = -s[i][y];
        s1 = s2 = 0;
               }
    for (i = 0; i < m; i++) {
        for (y = 0; y < n; y++) {
            s1 += s[y][i];
            s2 += -s[y][i];
            }
        if (s2 > s1)
           suma += s2;
        else
            suma += s1;
            }
    fout<<suma;
    return 0;
}