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

int N,M;
int a[NMAX][NMAX];


void citire()
{
    scanf("%d%d",&N,&M);
    for(int i=1; i<=N; i++)
        for(int j=1; j<=M; j++)
            scanf("%d",&a[i][j]);


}


int v[NMAX],smax;
void rezolvare()
{
    for(int x=0; x<(1<<N); x++)
    {

        for(int i=1; i<=M; i++)
            v[i]=0;

        for(int i=0; i<N; i++)
        {
            int p=1;
            if(x>>i&1)
                p=-1;
            for(int j=1;j<=M;j++)
                v[j]+=p*a[i+1][j];
        }
        int s=0;
        for(int i=1;i<=M;i++)
            s+=v[i]>0?v[i]:-v[i];
        if(s>smax)
            smax = s;

    }
    cout<<smax;
}

int main()
{
    freopen("flip.in","r",stdin);
    freopen("flip.out","w",stdout);
    citire();
    rezolvare();
    return 0;
}