#include <stdio.h>
#define MAXN 32

int n,m,a[MAXN][MAXN],i,j,rez = 0xf0f0f0f0;

inline int abs(int v)
{
    if ( v < 0)
    {
        return -v;
    }
    return v;
}

void back()
{
    int k,st[MAXN],sum,psum;
    st[1] = -3;
    k = 1;
    while (k>0)
    {
        if (st[k] < 1 && k <= n)
        {
            st[k]+=2;
            if (k == n)
            {
                sum = 0;
                for (i = 0 ; i < m;i++)
                {
                    psum = 0;
                    for (j=0; j < n ; j++)
                    {
                        psum+=a[j][i]*st[j+1];
                    }

                    psum = abs(psum);
                    sum+=psum;
                }
                if (sum > rez)
                {
                    rez = sum;
                }
            }
            else
            {
                k++;
                st[k] = -3;
            }
        }
        else
        {
            k--;
        }
    }
}

int main()
{
    freopen("flip.in","r",stdin);
    freopen("flip.out","w",stdout);

    scanf("%d%d",&n,&m);
    for (i=0;i<n;i++)
    {
        for (j=0;j<m;j++)
        {
            scanf("%d",&a[i][j]);
        }
    }

    back();

    printf("%d",rez);

    return 0;
}