using namespace std;
#include<cstdio>
#define Max 20
int a[Max][Max];
long long St;
int main()
{
	int i,j,n,m,S,Sm;
	freopen("flip.in","r",stdin);
	freopen("flip.out","w",stdout);
	scanf("%d %d",&n,&m);
	St=0;
	for(i=1;i<=n;i++)
	{
		S=0; Sm=0;
		for(j=1;j<=m;j++)
		{
			scanf("%d",&a[i][j]);
			S=S+a[i][j];
			Sm=Sm-a[i][j];
		}
		if(Sm>S)
			for(j=1;j<=m;j++)
				a[i][j]=-a[i][j];
	}
	for(j=1;j<=m;j++)
	{
		S=0; Sm=0;
		for(i=1;i<=n;i++)
		{
			S=S+a[i][j];
			Sm=Sm-a[i][j];
		}
		if(Sm>S)
			St=St+Sm;
		else
			St=St+S;
	}
	printf("%lld",St);
	return 0;
}