#include<iostream>
#include<fstream>
using namespace std;
int find_min(int a[],int n) {
  int pos=1;
  for(int i=2;i<=n;i++) {
   if(a[i]<a[pos]) pos=i;
  }
  return pos;
}
int main()
{
 ofstream fout ("flip.out");
 ifstream fin ("flip.in");
 int r[20]={0},c[20]={0},i,j,temp,n,m,a[20][20]={0},sum_r=0,sum_c=0;
 int 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);
   if(r[pos_r]>=0 && c[pos_c]>=0) break;
   else if(r[pos_r]<=c[pos_c]) {
      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];
        for(i=1;i<=m;i++) {
          c[i]=c[i]+(-2*a[pos_r][i]);
        }
      }
      else break;
   }
   else if(c[pos_c]<=r[pos_r]) {
      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]);
        }
      }
      else break; 
   }
 }
 fout<<sum_r;
// system("pause");
 return 0;
}