#include<stdio.h>
#define max(a,b) a<b?b:a
int abs(int a){return a<=0?-a:a;}
int n,m,a[17][17],S,st[17],nr,i,j;
int sum()
{int s=0,S;
 for(j=1;j<=m;j++)
 {S=0;
  for(i=1;i<=n;i++)
    S=S+a[i][j]*st[i];
  s+=abs(S);}
 return s;}
void back()
{if(nr==n)
 {int s=sum();
  S=max(s,S);
  return ;}
 nr++;
 st[nr]=1;
 back();
 st[nr]=-1;
 back();
 nr--;}
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]);
 back();
 printf("%d",S);
 fclose(stdout);
 return 0;}