#include<iostream>
#include<fstream>
using namespace std;

long int n, a[17][17],i,j, s1, s2,m,Smax;
int main(){ifstream f("flip.in");
	f>>n>>m; 
	Smax=0;
	for (i=1; i<=n; i++)
	{s1=0;
	s2=0;
		for(j=1; j<=m; j++)
			{f>>a[i][j];
			s1=s1+a[i][j];
			s2=s2+a[i][j]*-1;
			}
	if(s1>s2)
		Smax+=s1;
	else
		{Smax+=s2;
		for(j=1; j<=m; j++)
			a[i][j]=a[i][j]*-1;
		}
	}
	f.close();
	for (i=1; i<= m; i++)
	{s1=s2=0;
		for(j=1; j<= n; j++)
			{
			s1+=a[j][i];
			s2+=a[j][i]*-1;
		}
	if(s2>s1)
		{Smax=Smax-s1+s2;
		for(j=1; j<=n; j++)
			a[j][i]*=-1;
		}
	}
	ofstream f1("flip.out");
	f1<<Smax;;
	f1.close();
}