#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream cin("flip.in");
    ofstream cout("flip.out");
    int n,m,i,j,Max=0;
    cin>>n>>m;
    int v[n+1][m+1],suma=0;
    for (i=1; i<=n; i++) for (j=1; j<=m; j++) {cin>>v[i][j]; suma+=v[i][j];}
    if (suma>Max) Max=suma; suma=0;
    for (i=1; i<=n; i++) for (j=1; j<=m; j++)
    {
        suma=0;
        for (int i2=1; i2<=n; i2++)
        for (int j2=1; j2<=m; j2++)
        if (i2==i || j2==j) suma+=v[i2][j2]*-1;
        else suma+=v[i2][j2];
        if (suma>Max) Max=suma;
    }
    cout<<Max;
    return 0;
}