#include<stdio.h>
using namespace std;

int N,M,sol[20],Sf,v[20][20];

void calc()
{
int S,Q=0;
    for(int i=1;i<=N;++i)
    {
    S=0;
            for(int i2=1;i2<=M;++i2)
            {
                    S=S+(v[i][i2]*sol[i2]);
            }
            if(S<0)
                   S=-S;
            Q=Q+S;
    }
    if(Q>Sf)
            Sf=Q;
                   
}
void back(int k)
{    
         if(k==M+1)
         calc();
         else
         {
         sol[k]=-1;
         back(k+1);
         sol[k]=1;
         back(k+1);
         }
}
int main()
{  freopen("flip.in","r",stdin);
   freopen("flip.out","w",stdout); 
    scanf("%d %d",&N,&M);
    for(int i=1;i<=N;++i)
            for(int i2=1;i2<=M;++i2)
                    scanf("%d",&v[i][i2]);
   back(1);
   printf("%d",Sf);
   return 0;
}