#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
int main() {
	int N;
	cin >> N;
	int ma1 = -(1<<30), mi1 = (1<<30);
	int ma2 = -(1<<30), mi2 = (1<<30);
	for (int i = 0; i < N; ++ i) {
		int x, y;
		cin >> x >> y;
		ma1 = max(ma1, x-y);
		mi1 = min(mi1, x-y);
		ma2 = max(ma2, x+y);
		mi2 = min(mi2, x+y);
	}
	cout << max(ma1-mi1, ma2-mi2) << endl;
}
