#include<stdio.h>
int n,m,a[17][17],x[17],sol,sl,sm,i,j;
void read(),solve(),back(int c);
int main()
{
	read();
	solve();
	return 0;	
}
void read()
{
	freopen("flip.in","r",stdin);
	freopen("flip.out","w",stdout);
	scanf("%d%d",&n,&m);
	for(i=1;i<=n;i++)
		for(j=1;j<=m;j++)
			scanf("%d",&a[i][j]);
}
void solve()
{
	x[1]=1;
	back(2);
	printf("%d\n",sol);
}
void back(int c)
{
	if(c==m+1)
	{
		sm=0;
		for(i=1;i<=n;i++)
		{
			sl=0;
			for(j=1;j<=m;j++)
				sl+=x[j]*a[i][j];
			sl=sl>=0?sl:-sl;
			sm+=sl;
		}
		sol=sol>sm?sol:sm;
		return;
	}
	x[c]=1;back(c+1);
	x[c]=-1;back(c+1);
}