#include <iostream>
#include <fstream>
#define NMAX 17
using namespace std;

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

int a[NMAX][NMAX],n,m;
long long sum,x,y,sumMax;

int main()
{
    in >> n >> m;
    for(int i=0;i<n;i++)
    {
        for(int j=0;j<m;j++)
        {
            in >> a[i][j];
        }
    }

    for(int k=0;k<(1<<m);k++)
    {
        sum = 0;
        for(int i=0;i<n;i++)
        {
            x = 0;
            for(int j=0;j<m;j++)
            {
                if((1<<j) & k)
                {
                    x -=a[i][j];
                }
                else
                {
                    x+=a[i][j];
                }
            }
            if(x<0) x=(-1)*x;

            sum +=x;
        }
        if(sumMax<sum)
        {
            sumMax = sum;
        }
    }

    out << sumMax;

    return 0;
}