#include<iostream.h>
#include<fstream.h>
fstream f("flip.in",ios::in);
fstream g("flip.out",ios::out);
void main()
{
long n,s,m,v[100][100],i,j,p,t;
f>>n>>m;
for (i=1;i<=n;i++)
	       for (j=1;j<=n;j++)
			     f<<v[i][j]<<" ";
while (i<=n)
{
for (j=1;j<=m;j++)
		    s=s+v[1][j];
for (j=1;j<=m;j++)
		    v[1][j]=v[1][j]*(-1);
		    p=p+v[1][j];
	  if (s>p) t=t+s;
		   else t=t+p;
i++;
}
g<<t;
}