#include <stdio.h>

int main()
{
	int n,m,i,j,l,c;
	int a[16][16],ml=0,mc=0,sc,sl;
	long long suma=0;
	FILE* f=fopen("flip.in","rt");
	FILE* g=fopen("flip.out","wt");

	fscanf(f,"%d%d", &n,&m);

	for (i=1;i<=n;i++)
	{
		for (j=1;j<=m;j++)
		{
			fscanf(f,"%d", &a[i][j]);
		}
	}

	for (i=1;i<=n;i++)
	{
		sl=0;
		for (j=1;j<=m;j++)
		{
			sl+=a[i][j];
		}
		if (ml>sl)
		{
			ml=sl;
			l=i;
		}
	}

	for (i=1;i<=m;i++)
	{
		sc=0;
		for (j=1;j<=n;j++)
		{
			sc+=a[j][i];
		}
		if (mc>sc)
		{
			mc=sc;
			c=i;
		}
	}

	for (i=1;i<=n;i++)
	{
		a[i][c]*=(-1);
	}

	for (i=1;i<=m;i++)
	{
		a[l][i]*=(-1);
	}
	
	for (i=1;i<=n;i++)
		for(j=1;j<=m;j++)
			suma+=a[i][j];

	fprintf(g,"%d",suma);

	fclose(f);
	fclose(g);
	
	return 0;
}