#include <iostream>
#include <fstream>
using namespace std;
ifstream f("flip.in") ;
ofstream g("flip.out") ;
int n , m , a[20][20] , i , j , mi = 1000000  , s  , l  , k ;
int main()
{ f >> n >> m ;
for ( i = 1 ; i <= n ; i ++ )
    for ( j = 1 ; j <= m ; j ++ )
        f >> a[i][j] ;

     mi = 1000000 ;
    for ( i = 1 ; i <= n ; i ++ )
    {
        s = 0 ;
        for( j = 1 ; j <= m ; j ++ )
             s = s + a[i][j] ;
               if ( s < mi )
               {
                 mi = s ;
                l = i  ;
                }
     }
  for ( j = 1 ; j <= m ; j ++ )
 {
     s = 0 ;
     for ( i = 1 ; i <= n ; i ++ )
      s = s + a[i][j] ;
      if ( s < mi )
      {
          mi = s ;
          k = j ;
      }
 }
    for ( i = l ; i <= l ; i ++ )
        for ( j = 1 ; j <= m ; j ++ )
          a[i][j] = - a[i][j] ;
    for ( j = k ; j <= k ; j ++ )
        for ( i = 1 ; i <= n ; i ++ )
          a[i][j] = - a[i][j] ;
         s = 0 ;
     for ( i = 1 ; i <= n ; i ++ )
        for ( j = 1 ; j <= m ; j ++ )
         s = s + a[i][j] ;
     g << s ;
    return 0;
}