#include <bits/stdc++.h>
using namespace std;
 
ifstream in("flip.in");
ofstream out("flip.out");

int n, m, a[20][20], v[50], ans;

// v[i] = 1 => linia i este inmultita cu 1
// v[i] = -1 => linia i este inmultita cu -1

void solve() {
    int sum = 0;
    for(int j = 1; j <= m; ++j) {
        int sCol = 0;
        for(int i = 1; i <= n; ++i) {
            sCol += (v[i] * a[i][j]);
        }

        if(sCol < 0) {
            sCol = -sCol;
        }

        sum += sCol;
    }

    ans = max(ans, sum);
}

void back(int k) {
    for(int i = -1; i <= 1; i += 2) {
        v[k] = i;
        if(k == n) {
            solve();
        } else {
            back(k + 1);
        }
    }
}

int main() {
    ios::sync_with_stdio(false); in.tie(0); out.tie(0);

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

    back(1);

    out << ans << "\n";

    in.close(); out.close();

    return 0;
}