#include <iostream>
#include <fstream>
using namespace std;
int main()
{ int a[50][50],n, m , i,s1 ,j,s=0;
 ifstream f("flip.in");
 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++)
   { s1=0;
      for(j=1;j<=m;j++)
        { s1=s1+a[i][j];
        if(s1<(-1*s1)) s1=-1*s1;}
      s=s+s1;}
 for(j=1;j<=m;j++)
  {s1=0;
    for(i=1;i<=n;i++)
     {s1=s1+a[i][j];
      if(s1<(-1*s1)) s1=-1*s1;}
     s=s+s1;
     }
   f.close();
   ofstream g("flip.out");
     g<<s;
    g.close();
  return 0;
}