#include <bits/stdc++.h>
using namespace std;

int main() {
  int n;
  cin>>n;
  int plus[n];
  int x_y[n];
  int y_x[n];

  for(int i=0; i<n; i++) {
    int x,y;
    cin>>x>>y;
    plus[i] = x+y;
    x_y[i] = x-y;
    y_x[i] = y-x;
  }

  sort(plus, plus+n);
  sort(x_y, x_y+n);
  sort(y_x, y_x+n);

  int tmp1 = plus[n-1] - plus[0];
  int tmp2 = x_y[n-1] + y_x[n-1];

  cout<<max(tmp1, tmp2)<<endl;


  return 0;
}