#include <iostream.h>
#include <fstream.h>
#define N 17

ifstream f("flip.in");
ofstream g("flip.out");
int T[N][N];
long S_LIN[N],S_COL[N];

int main()
{
	int n,m,i,j,lin,col,min_lin,min_col,s=0;
	
	f>>n>>m;
	for(i=1;i<=n;i++)
		for(j=1;j<=m;j++)
			f>>T[i][j];
	
	for(i=1;i<=n;i++)
	{
		S_LIN[i]=0;
		for(j=1;j<=m;j++)
			S_LIN[i]+=T[i][j];
		if(i==1)
			min_lin=S_LIN[i];
		else
			if(S_LIN[i]<min_lin)
				min_lin=S_LIN[i], lin=i;
	}

	for(i=1;i<=m;i++)
	{
		S_COL[i]=0;
		for(j=1;j<=n;j++)
			S_COL[i]+=T[j][i];
		if(i==1)
			min_col=S_COL[i];
		else
			if(S_COL[i]<min_col)
				min_col=S_COL[i], col=i;
	}
	
	for(i=1;i<=n;i++)
		for(j=1;j<=m;j++)
		{
			if(i==lin)
				T[i][j]=T[i][j]*(-1);
			if(j==col)
				T[i][j]=T[i][j]*(-1);
			s+=T[i][j];
		}
	
	g<<s;


	f.close();
	g.close();
	return 0;
}