#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
long int i,j,m,n,k,aux,b[1000],a[100][100],smat,s,mx=-1;
int main()
{   f>>n>>m;
    int  mx=-1;
    for(i=1;i<=n;i++)
       for(j=1;j<=m;j++)
          f>>a[i][j];
    for(i=0;i<(1<<n);i++){
      aux=i;
        for(j=1;j<=n;j++){
          b[j]=aux&1;
          aux>>=1;
       }
    smat=0;
    for(k=1;k<=m;k++)
       {
       s=0;
       for(j=1;j<=n;j++)
         {
          if(b[j])
            s+=a[j][k];
              else s-=a[j][k];
          }
      if(s<0)
         smat-=s;
           else smat+=s;
      }
    if(smat>mx)
      mx=smat;
    }
    g<<mx;

    f.close();g.close();
    return 0;
}