#include<fstream>
#include<iostream>
using namespace std;
int main ()
{int n,m,a[17][17],s=0,s1=0,s2=0,i,j;
ifstream f("flip.in");
f>>n;
f>>m;
for (i=1;i<=n;i++)
	for (j=1;j<=m;j++)
	   {f>>a[i][j];
	    s=s+a[i][j];
	   }
for (i=1;i<=n;i++)
	for (j=1;j<=m;j++)
	{s1=s1+a[i][j];
	 s2=s2-a[i][j];
	 if (s2>s1)
	  {for (j=1;j<=m;j++)
		 a[i][j]=-a[i][j];
	   s=s+s2-s1;
	  }
	}
s1=0;
s2=0;
for (j=1;j<=m;j++)
	for (i=1;i<=n;i++)
	{s1=s1+a[i][j];
	 s2=s2-a[i][j];
	 if (s2>s1)
     {for (i=1;i<=m;i++)
	     a[i][j]=-a[i][j];
	   s=s+s2-s1;
	 }
	}
ofstream g("flip.out");
g<<s;
f.close();
g.close();
return 0;
}