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

ifstream fin("flip.in");
ofstream fout("flip.out");
#define cin fin
#define cout fout

long long X[20], A[20][20], n, m, maxi = -1;

void ComputeSum(){
    long long sum, rez = 0;
    for(int j = 1; j <= m; ++j){
        sum = 0;
        for(int i = 1; i <= n; ++i)
            sum += X[i] * A[i][j];
       rez += abs(sum);
    }
    if(rez > maxi)
        maxi = rez;
}

void Back(int k){
    if(k > n)
        ComputeSum();
    else {
        X[k] = 1;
        Back(k + 1);
        X[k] = -1;
        Back(k + 1);
    }
}

int main()
{
    cin >> n >> m;
    for(int i = 1; i <= n; ++i)
        for(int j = 1; j <= m; ++j)
            cin >> A[i][j];
    Back(1);
    cout << maxi;
    return 0;
}