#include <fstream>
using namespace std;

ifstream fin("flip.in");
ofstream fout("flip.out");

const int N = 16;

int n, m, a[N][N], oriz[N], vert[N], total;

int main()
{
    fin>>n>>m;
    for(int i=0;i<n;++i)
        for(int j=0;j<m;++j)
            fin>>a[i][j], oriz[i]+=a[i][j], vert[j]+=a[i][j], total+=a[i][j];

    int sol=total;
    for(int i=0;i<n;++i)
        for(int j=0;j<m;++j)
            sol=max(sol, total-2*vert[j]-2*oriz[i]+4*a[i][j]);

    fout<<sol;
    return 0;
}