#include<cstdio>
int n, m, a[1000][1000], s1[1000], s2[1000],i, j, minim1, minim2, p1, p2, s;
int main()
{
  freopen("flip.in", "r", stdin);
  freopen("flip.out", "w", stdout);
  
  scanf("%d %d", &n, &m);
  
  for(i=1; i<=n; ++i)
	  for(j=1; j<=m; ++j) { scanf("%d", &a[i][j]);
							s1[i]+=a[i][j];
						    s2[j]+=a[i][j];
	                      }
	  
  minim1=s1[1];
  minim2=s2[1];
  for(i=2; i<=n; ++i) if(s1[i]<minim1) { minim1=s1[i];
                                         p1=i;
                                       }  
  for(i=2; i<=m; ++i) if(s2[i]<minim2) { minim2=s2[i];
                                         p2=i;
                                       }  
  
  for(i=1; i<=m; ++i) a[p1][i]=-a[p1][i];
  for(i=1; i<=n; ++i) a[i][p2]=-a[i][p2];
  
  for(i=1; i<=n; ++i)
	  for(j=1; j<=m; ++j) s+=a[i][j];
  
  printf("%d ", s);/*
  
  for(i=1; i<=n; ++i) printf("%d ", s1[i]);
  printf("\n");
  for(i=1; i<=m; ++i) printf("%d ", s2[i]);
  
  printf("\n%d %d\n", minim1, minim2); 
  printf("%d %d\n", p1, p2);
  */
  fclose(stdin);
  fclose(stdout);
  return 0;
}