#include <bits/stdc++.h>
using namespace std;
using ll = long long;
constexpr ll inf = 1ll << 60;

int main(){
    ios::sync_with_stdio(false);
    cin.tie(0);
    int n;
    cin >> n;
    array<ll, 4> tmp = {-inf, inf, -inf, inf};
    for(int i = 0; i < n; i++){
        ll x, y;
        cin >> x >> y;
        tmp[0] = max(tmp[0], x + y);
        tmp[1] = min(tmp[1], x + y);
        tmp[2] = max(tmp[2], x - y);
        tmp[3] = min(tmp[3], x - y);
    }
    cout << max(tmp[0] - tmp[1], tmp[2] - tmp[3]) / 2 << '\n';
}