#include<stdio.h>
long n,m,a[16][16],smax;
int main(void){
long i,j,k,s,t;
freopen("flip.in","r",stdin);
scanf("%ld %ld",&n,&m);
for(i=0;i<n;i++)
 for(j=0;j<m;j++)
  scanf("%ld",a[i][j]);
for(i=0;i<(1<<m);i++){
 s=0;
 for(k=0;k<n;k++){
  for(t=j=0;j<m;j++)
   if(i&(1<<j)) t+=-a[k][j]; else t+=a[k][j];
  s+=t<-t ? -t : t;
 }
 if(smax<s) smax=s;
}
freopen("flip.out","w",stdout);printf("%ld\n",smax);
return 0;
}