#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in");
ofstream g("flip.out");
int a[100][100],i,j,maxi,m,n,sm,s,v[100],l;
int main()
{
    f>>n>>m;
    for(i=1;i<=n;i++)
      for(j=1;j<=m;j++)f>>a[i][j];
    for(i=1;i<=n;i++){s=0;sm=0;
      for(j=1;j<=m;j++){s=s+a[i][j];v[j]=a[i][j]*(-1); }
                       for(l=1;l<=m;l++)sm=sm+v[l];
                       if(sm>s)
                         for(l=1;l<=m;l++){a[i][l]=v[l];v[l]=0;}
                         for(l=1;l<=m;l++)v[l]=0; }

    for(j=1;j<=m;j++){s=0;sm=0;
      for(i=1;i<=n;i++){s=s+a[i][j];v[i]=a[i][j]*(-1);}
                       for(l=1;l<=n;l++)sm=sm+v[l];
                       if(sm>s)
                         for(l=1;l<=n;l++){a[l][j]=v[l];v[l]=0; }
                         for(l=1;l<=n;l++)v[l]=0;
                       }s=0;sm=0;
    for(i=1;i<=n;i++)
      for(j=1;j<=m;j++)s=s+a[i][j];
      g<<s;


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