#include <fstream>
using namespace std;
ifstream g("flip.in");
ofstream h("flip.out");
int pe_randuri(int a[16][16],int n,int m,int &s)
{
	int i,j,sp,sn;
	for(i=0;i<n;i++)
	{
		for(j=0,sn=0,sp=0;j<m;j++)
			if(a[i][j]>=0)
				sp+=a[i][j];
			else
				sn-=a[i][j];
		if(sn>sp)
			s+=2*(sn-sp);
	}
	return 0;
}
int pe_coloane(int a[16][16],int n, int m, int &s)
{
	int i,j,sn,sp;
	for(i=0;i<m;i++)
	{
		for(j=0,sn=0,sp=0;j<n;j++)
			if(a[j][i]>=0)
				sp+=a[j][i];
			else
				sn-=a[j][i];
		if(sn>sp)
			s+=2*(sn-sp);
	}
	return 0;
}
int main ()
{
int n,m,a[16][16],i,j,s,s1,s2;
g>>n>>m;
for(i=0,s=0;i<n;i++)
	for(j=0;j<m;j++)
	{
		g>>a[i][j];
		s+=a[i][j];
	}
s1=s2=s;
pe_randuri(a,n,m,s1);
pe_coloane(a,n,m,s1);
pe_coloane(a,n,m,s2);
pe_randuri(a,n,m,s2);
if(s1>s2)
	s=s1;
else
	s=s2;
h<<s;
return 0;
}