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

int main()
{
    freopen("flip.in", "r", stdin);
    freopen("flip.out", "w", stdout);
    cin.tie(nullptr)->sync_with_stdio(false);
    int n, m;
    cin >> n >> m;
    vector<vector<int>> v(n + 2, vector<int>(m + 2));

    for(int i = 1; i <= n; i++)
    {
        for(int j = 1; j <= m; j++)
        {
            cin >> v[i][j];
        }
    }

    fclose(stdin);

    int ans = 0;
    for(int msk = 0; msk < (1 << m); msk++)
    {
        int sum = 0;
        for(int i = 1; i <= n; i++)
        {
            int csm = 0;
            for(int j = 1; j <= m; j++)
            {
                csm += v[i][j] * ((msk & (1 << (j - 1))) ? (-1) : (1));
            }
            sum += (csm < 0) ? (-csm) : (csm);
        }
        ans = max(ans, sum);
    }
    cout << ans;

    fclose(stdout);
}