#include<stdio.h>
	long n,m,a[100][100],smax;
void main ()
{
	long i,j,k,s,t;
	freopen ("flip.in","r",stdin) ;
	scanf ("%lld %lld", &n,&m);
	for(i=0;i<n;i++)
		for(j=0;j<m;j++) scanf("%lld",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("%lld\n",smax);
}