#include<iostream>
#include<fstream>
#define ll long long
using namespace std;
ll find_min(ll a[],ll n) {
  ll pos=1;
  for(ll i=2;i<=n;i++) {
   if(a[i]<a[pos]) pos=i;
  }
  return pos;
}
int main()
{
 ofstream fout ("flip.out");
 ifstream fin ("flip.in");
 ll r[20]={0},c[20]={0},i,j,temp,n,m,a[20][20]={0},sum_r=0,sum_c=0;
 ll min_r,min_c,pos_r,pos_c;
 fin>>n>>m;
 for(i=1;i<=n;i++) {
   for(j=1;j<=m;j++) fin>>a[i][j];
 }
 for(i=1;i<=n;i++) {
   temp=0;
   for(j=1;j<=m;j++) temp+=a[i][j];
   r[i]=temp; 
   sum_r+=r[i];
 }
 for(j=1;j<=m;j++) {
   temp=0;
   for(i=1;i<=n;i++) temp+=a[i][j];
   c[j]=temp;
   sum_c+=c[j];
 }
 while(true) {
   pos_r=find_min(r,n);
   pos_c=find_min(c,m);
//   cout<<r[pos_r]<<" "<<c[pos_c]<<endl;
   if(r[pos_r]>=0 && c[pos_c]>=0) break;
   else if(r[pos_r]<=c[pos_c]) {
//      cout<<"it comes to row"<<endl;
      if(sum_r-2*r[pos_r]>sum_c) {
        sum_r=sum_r-2*r[pos_r];
        sum_c=sum_r;
        r[pos_r]=-1*r[pos_r];
//        cout<<"value of c[i]   ";
        for(i=1;i<=m;i++) {
          c[i]=c[i]-2*a[pos_r][i];
          a[pos_r][i]=-1*a[pos_r][i];
        }
      }
      else break;
   }
   else if(c[pos_c]<=r[pos_r]) {
//      cout<<"it comes to column"<<endl;
      if(sum_c+(-2*c[pos_c])>sum_r) {
        sum_c=sum_c+(-2*c[pos_c]);
        sum_r=sum_c;
        c[pos_c]=-1*c[pos_c];
        for(i=1;i<=n;i++) {
          r[i]=r[i]-2*a[i][pos_c];
          a[i][pos_c]=-1*a[i][pos_c];
        }
      }
      else break; 
   }
/*   for(i=1;i<=n;i++) cout<<r[i]<<" ";
   cout<<endl;
   for(i=1;i<=m;i++) cout<<c[i]<<" ";
   cout<<endl;*/
 }
// for(i=1;i<=n;i++) cout<<r[i]<<" ";
 fout<<sum_r;
// system("pause");
 return 0;
}