#include<fstream>
using namespace std;
int v[1000][1000],s1,s2,s,m,n;
void citire()
{int i,j;
     ifstream fin("flip.in");
     fin>>n>>m;
     for(i=1;i<=n;i++)
     for(j=1;j<=m;j++)
     {fin>>v[i][j];v[i][0]+=v[i][j];v[0][j]+=v[i][j];s+=v[i][j];}
     fin.close();
     }
    void rezolvare()
    {int i,j;
    ofstream fout("flip.out");
     for(j=1;j<=n;j++)
         if(v[j][0]<0){v[j][0]*=-1;s1+=v[j][0];}
         for(j=1;j<=m;j++)
         if(v[0][j]<0){v[0][j]*=-1;s2+=v[0][j];}
         fout<<s+(2*s1)+(2*s2);
         fout.close();
         }
     int main()
     {citire();
         rezolvare();
         return 0;}