#include <iostream>
#include <fstream>

using namespace std;

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

unsigned int n,m;
int mat[20][20],sol[20],maxsum,k;

void bkt (int k)
{
    if(k==m+1)
    {
        int i,j,sum = 0,ans = 0;

        for(i = 1; i <= n; i++)
        {
            sum = 0;
            for(j = 1; j <= m; j++)
            {
                sum += mat[i][j]*sol[j];
            }
            if(sum < 0)
                sum = -sum;

            ans += sum;
        }
        maxsum = max(maxsum,ans);
    }

    else
    {
        sol[k] = 1;
        bkt(k+1);
        sol[k] = -1;
        bkt(k+1);
    }
}
int main()
{
    fin>>n>>m;

    for(int i=1;i<=n;i++)
        for(int j=1;j<=m;j++)
        fin>>mat[i][j];


    bkt(1);
    fout<<maxsum;

    return 0;
}