#include <stdio.h>
FILE* f=fopen("flip.in","r");
FILE* g=fopen("flip.out","w");
long v[1000],x,n2,n,i,j,v2[1000],m[1000][1000],sav1,sav2,maxc,maxl,s;
int main()
{
	fscanf(f,"%ld%ld",&n,&n2);
	for (i=1;i<=n;i++)
	{
		for (j=1;j<=n2;j++)
		{
			fscanf(f,"%ld",&m[i][j]);
			
			v[i]=v[i]+m[i][j];
		}
	}
	for (i=1;i<=n2;i++)
		for (j=1;j<=n;j++)
			
			v2[i]=v2[i]+m[j][i];
	if (n>n2) x=n;
	else x=n2;
	for (i=1;i<=n;i++)
	{
		if (v[i]<maxc) 
		{
			sav1=i;
			maxc=v[i];
		}
		if (v2[i]<maxl) 
		{
			sav2=i;
			maxl=v2[i];
		}
	}
	
	for (i=1;i<=n2;i++)
		m[sav1][i]=m[sav1][i]*-1;
	
	for (i=1;i<=n;i++)
		m[i][sav2]=m[i][sav2]*-1;
	for (i=1;i<=n;i++)
		for (j=1;j<=n2;j++)
			s=s+m[i][j];
	fprintf(g,"%ld\n",s);
	fclose(f);
	return 0;
}