#include <cstdio>
int main() {
    freopen ("flip.in", "r", stdin), freopen ("flip.out", "w", stdout);
    int n, m, a[16][16];
    scanf("%d %d", &n, &m);
    for (int i = 0; i < n; i++) {
        for (int j = 0; j < m; j++) {
            scanf("%d", &a[i][j]);
        }
    }
    int best = -(int) 1e9;
    for (int mask = 0; mask < (1 << m); mask++) {
        int cur = 0;
        for (int i = 0; i < n; i++) {
            int sum = 0;
            for (int j = 0; j < m; j++) {
                if (mask & (1 << j)) {
                    sum += a[i][j];
                } else {
                    sum -= a[i][j];
                }
            }
            cur += (sum > 0) ? sum : -sum;
        }
        best = (cur > best) ? cur : best;
    }
    printf("%d\n", best);
}