#include <iostream>
#include <fstream>

using namespace std;

int main()
{
    ifstream in("./filip.in", ios_base::in);
    int N, M;
    in >> N >> M ;
    int matrice [N][M];

    for(int i=0; i < N; i++){
        for (int j = 0; j< M; j++){
            in >> matrice[i][j];

        }
     }

    int suma = 0;

    for (int n=0; n<N; n++){
        for(int m = 0; m<M; m++){
            int a [N][M];
            for(int i=0; i < N; i++){
                for(int j = 0; j< M; j++){
                    a[i][j] = matrice[i][j];
                }
            }
            for (int i=0; i<M; i++){
                a[n][i]=a[n][i]*-1;
            }
            for (int i=0; i<N; i++){
                a[i][m]=a[i][m]*-1;
            }
            int h = 0;
            for(int i=0; i < N; i++){
                for(int j = 0; j< M; j++){

                    h = h + a[i][j];
                    if (h>suma){
                        suma = h;
                    }
                }
            }
        }
    }

    ofstream out("./filip.out");
    out << suma;
    return 0;
}