#include<fstream>
using namespace std;
int n,m,i,j;
long a[17][17],s,ss,s1,s2;
int main()
{
	ifstream fin("flip.in");
	ofstream fout("flip.out");
fin>>n;
fin>>m;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
	fin>>a[i][j];
for(i=1;i<=n;i++)
{
	s1=0;s2=0;
	for(j=1;j<=m;j++)
		{s1=s1+a[i][j];s2=s2+a[i][j]*-1;}
		if (s1>s2) s=s1+s; else s=s+s2;

}

for(j=1;j<=m;j++)
{
	s1=0;s2=0;
	for(i=1;i<=n;i++)
		{s1=s1+a[i][j];s2=s2+a[i][j]*-1;}
		if (s1>s2) ss=s1+ss; else ss=ss+s2;

}
if (ss>s) fout<<ss<<'\n'; else  fout<<s<<'\n';
fin.close();
fout.close();
return 0;
}