#include <cstdio>
#include <iostream>
#include <set>
#include <climits>
#include <map>
#include <algorithm>
#include <list>
#include <vector>
#include <utility>
#include <cstdlib>
#include <iomanip>
#include <cstring>
#include <string>

using namespace std;

int main() {
 //   freopen("tt.txt", "r", stdin);
    freopen("flip.in", "r", stdin);
    freopen("flip.out", "w", stdout);

    ios::sync_with_stdio(false);
    cin.tie(0);

    int n, m, a[16][16];
    cin >> n >> m;
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            cin >> a[i][j];
        }
    }

    int e[16];
    e[0] = 1;
    for (int i = 1; i <= n; i++) {
        e[i] = e[i - 1] << 1;
    }

    int ans = LONG_MIN;
    for (int k = 0; k < e[n]; k++) {
        int sum[16];
        for (int j = 0; j < m; j++)
            sum[j] = 0;

        for (int i = 0; i < n; i++) {
            int coeff = ((k & e[i]) == 0) ? 1 : -1;

            for (int j = 0; j < m; j++)
                sum[j] += coeff * a[i][j];
        }

        int totalSum = 0;
        for (int j = 0; j < m; j++)
            totalSum += abs(sum[j]);

        if (totalSum > ans)
            ans = totalSum;
    }

    cout << ans;

    return 0;
}