#include <bits/stdc++.h>
using namespace std;

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

int n, m;
int mat[17][17], i, j, ma, s;
int pos1, pos2;

int main(){
    in>>n>>m;
    for(i = 0; i<n; i++){
        for(j = 0; j<m; j++) in>>mat[i][j], mat[i][m] += mat[i][j] , mat[n][j] += mat[i][j];
    }
    ma = 99999999;
    for(j = 0; j<m; j++) if(mat[n][j] < ma) ma = mat[n][j], pos1 = j;
    ma = 99999999;
    for(i = 0; i<n; i++) if(mat[n][i] < ma) ma = mat[i][m], pos2 = i;
    // out<<pos1<<" "<<pos2;
    for(i = 0; i<n; i++){
        for(j = 0; j<m; j++){
            if(j == pos1 || i == pos2) mat[i][j] *= -1;
            s += mat[i][j];
        }
    }
    out<<s;
}