#include <iostream>
#include <fstream>

using namespace std;

ifstream fin("flip.in");
ofstream fout("flip.out");

int N,M;
int A[20][20];
int X[20];
int MSum;

void Read()
{
    fin>>N>>M;

    for(int i=1;i<=N;i++)
        for(int j=1;j<=M;j++)
            fin>>A[i][j];
}

void Solve()
{
    int Sum=0;

    for(int j=1;j<=M;j++)
    {
        int s=0;
        for(int i=1;i<=N;i++)
            s += A[i][j] * X[i];
        if (s < 0)
            s *= -1;
        Sum += s;
    }
    MSum = max(MSum,Sum);
}

void Back(int l)
{
    for(int i=-1;i<=1;i+=2)
    {
        X[l] = i;
        if (l == N)
            Solve();
        else
            Back(l+1);
    }
}

int main()
{
    Read();
    Back(1);
    fout<<MSum;
    return 0;
}