#include <stdio.h>
#include <stdlib.h>
int n,m,max,a[17][17],v[17];
void bkt(int ct)
{
    if(ct>m){
        int i,j,suma,sum;
        suma=0;
        for(i=1; i<=n; i++){
            sum=0;
            for(j=1; j<=m; j++)
                sum+=a[i][j]*v[j];
            suma+=abs(sum);
        }
        if(suma>max)
            max=suma;
    }
    else
        for(v[ct]=-1; v[ct]<=1; v[ct]+=2) bkt(ct+1);
}
int main()
{
    int i,j;
    freopen("flip.in","r",stdin);
    freopen("flip.out","w",stdout);
    scanf("%d%d",&n,&m);
    for(i=1; i<=n; i++)
        for(j=1; j<=m; j++)
            scanf("%d",&a[i][j]);
    bkt(1);
    printf("%d\n",max);

    return 0;
}