#include <bits/stdc++.h>
using namespace std;
long long n,x,y,maxa,mina,maxb,minb;
int main()
{
	cin>>n;
	for(int i=1;i<=n;i++)
	{
		cin>>x>>y;
		if(i==1)
		{
			maxa=mina=x+y;
			maxb=minb=x-y;
		}
		maxa=max(maxa,x+y);
		maxb=max(maxb,x-y);
		mina=min(mina,x+y);
		minb=min(minb,x-y);
	}
	cout<<max(maxa-mina,maxb-minb);
	return 0;
}