#include<stdio.h>        
 long int a[17][17],cod,k,p,sl,nl,nc,i,j,sm,sc;        
 int main()        
 {        
     freopen("flip.in","rt",stdin);        
     freopen("flip.out","wt",stdout);        
     scanf("%ld%ld",&nl,&nc);        
     for(i=0;i<nl;i++)        
      for(j=0;j<nc;j++)        
       scanf("%ld",&a[i][j]);        
     k=1<<(nc-1);        
     for(p=0;p<k;p++)        
     { sc=0;        
       for(i=0;i<nl;i++)        
       {sl=0;cod=p;        
        for(j=0;j<nc;j++)        
        { sl+=(((cod&1)<<1)-1)*a[i][j];cod>>=1;}        
        sl=(sl<0)?(-sl):sl;sc+=sl;        
       }        
       sm=(sm>sc)?sm:sc;        
     }        
     printf("%ld\n",sm);        
     return 0;        
 }