#define CPP17
#include <limits>
#include <initializer_list>
#include <utility>
#include <bitset>
#include <tuple>
#include <type_traits>
#include <functional>
#include <string>
#include <array>
#include <deque>
#include <list>
#include <queue>
#include <stack>
#include <vector>
#include <map>
#include <set>
#include <unordered_map>
#include <unordered_set>
#include <iterator>
#include <algorithm>
#include <complex>
#include <random>
#include <numeric>
#include <iostream>
#include <iomanip>
#include <sstream>
#include <regex>
#include <cassert>
#include <cstddef>
#ifdef CPP17
#include <variant>
#endif

#define endl codeforces

#define ALL(v) std::begin(v), std::end(v)
#define ALLR(v) std::rbegin(v), std::rend(v)

using ll = std::int64_t;
using ull = std::uint64_t;
using pii = std::pair<int, int>;
using tii = std::tuple<int, int, int>;
using pll = std::pair<ll, ll>;
using tll = std::tuple<ll, ll, ll>;
using size_type = ssize_t;
template <typename T> using vec = std::vector<T>;
template <typename T> using vvec = vec<vec<T>>;

template <typename T> const T& var_min(const T &t) { return t; }
template <typename T> const T& var_max(const T &t) { return t; }
template <typename T, typename... Tail> const T& var_min(const T &t, const Tail&... tail) { return std::min(t, var_min(tail...)); }
template <typename T, typename... Tail> const T& var_max(const T &t, const Tail&... tail) { return std::max(t, var_max(tail...)); }
template <typename T, typename... Tail> void chmin(T &t, const Tail&... tail) { t = var_min(t, tail...); }
template <typename T, typename... Tail> void chmax(T &t, const Tail&... tail) { t = var_max(t, tail...); }

template <typename T, std::size_t Head, std::size_t... Tail> 
struct multi_dim_array { using type = std::array<typename multi_dim_array<T, Tail...>::type, Head>; };

template <typename T, std::size_t Head> 
struct multi_dim_array<T, Head> { using type = std::array<T, Head>; };

template <typename T, std::size_t... Args> using mdarray = typename multi_dim_array<T, Args...>::type;

#ifdef CPP17
template <typename T, typename F, typename... Args> 
void fill_seq(T &t, F f, Args... args) { 
    if constexpr (std::is_invocable<F, Args...>::value) { 
        t = f(args...); 
    } else { 
        for (size_type i = 0; i < t.size(); i++) fill_seq(t[i], f, args..., i); 
    } 
}
#endif

template <typename T> vec<T> make_v(size_type sz) { return vec<T>(sz); }

template <typename T, typename... Tail> 
auto make_v(size_type hs, Tail&&... ts) { 
    auto v = std::move(make_v<T>(std::forward<Tail>(ts)...)); 
    return vec<decltype(v)>(hs, v); 
}

namespace init__ { 
struct InitIO { 
    InitIO() { 
        std::cin.tie(nullptr); 
        std::ios_base::sync_with_stdio(false); 
        std::cout << std::fixed << std::setprecision(30); 
    } 
} init_io; 
}
template <typename T>
T ceil_pow2(T bound) {
    T ret = 1;
    while (ret < bound) ret *= 2;
    return ret;
}
template <typename T>
T ceil_div(T a, T b) { return a / b + !!(a % b); }
#define CPP17


namespace utility {

template <typename T>
using validate_integer = typename std::enable_if<std::is_integral<T>::value, ll>::type;

template <typename T>
auto popcount(T n) -> validate_integer<T> {
    return __builtin_popcountll(n);
}

// 0 indexed
template <typename T>
auto msb(T n) -> validate_integer<T> {
    return 64 - __builtin_clzll(n) - 1;
}

}

namespace segtree {

template <typename M>
struct SegmentTree {
    vec<M> nodes;

    auto get_children_idx(size_type idx) {
        return std::make_pair(2 * idx, 2 * idx + 1);
    }

    void update_node(size_type i) {
        auto [ a, b ] = get_children_idx(i);
        nodes[i] = M::merge(nodes[a], nodes[b]);
    }

public:
    template <typename F>
    SegmentTree(F f, size_type sz) {
        build(f, sz);
    }

    template <typename F>
    void build(F f, size_type sz) {
        nodes.resize(ceil_pow2(sz) * 2);
        for (size_type i = 0; i < sz; i++) {
            nodes[i + sz] = f(i);
        }
        for (size_type i = sz - 1; 1 <= i; i--) update_node(i);
    }

    size_type size() const {
        return nodes.size() / 2;
    }

    const M& operator [](size_type i) const {
        return nodes[size() + i];
    }

    M get_query(ll ql, ll qr) const {
        M ret;
        size_type lnode = ql + size(), rnode = qr + size();
        while (lnode < rnode) {
            if (lnode & 1) {
                ret = M::merge(nodes[lnode], ret);
                lnode++;
            }
            if (rnode & 1) {
                rnode--;
                ret = M::merge(ret, nodes[rnode]);
            }
            lnode /= 2;
            rnode /= 2;
        }
        return ret;
    }

    void update_query(ll idx, M val) {
        idx += size();
        nodes[idx] = val;
        while (1 < idx) {
            ll pidx = idx / 2;
            update_node(pidx);
            idx = pidx;
        }
    }

    template <typename F>
    size_type lower_bound(F f) const {
        M sum;
        size_type l = 0, r = size(), idx = 0, bidx = 0;
        if (!f(nodes[0])) return -1;
        while (true) {
            if (r - l == 1) {
                if (!f(sum)) bidx++;
                break;
            }
            auto lidx = 2 * idx;
            auto ridx = lidx + 1;
            auto nsum = M::merge(sum, nodes[lidx]);
            size_type m = (l + r) / 2;
            if (f(nsum)) {
                r = m;
                idx = lidx;
            } else {
                l = m;
                idx = ridx;
                bidx = m;
                sum = std::move(nsum);
            }
        }
        return bidx;
    }
};

}

namespace utility {

template <typename T>
struct Compressor {
    Compressor(vec<T> arg) : v(std::move(arg)) {
        std::sort(ALL(v));
        auto ite = std::unique(ALL(v));
        v.erase(ite, v.end());
    }

    const T& operator [](size_type i) const {
        return v[i];
    }

    size_type get(const T &t) const {
        return std::distance(v.begin(),
                             std::lower_bound(ALL(v), t));
    }

    size_type size() const {
        return v.size();
    }

    template <typename U = T>
    vec<U> compress(const vec<T> &v) const {
        vec<U> ret(v.size());
        for (size_type i = 0; i < v.size(); i++) ret[i] = get(v[i]);
        return ret;
    }

    const vec<T>& raw() const noexcept {
        return v;
    }

private:
    vec<T> v;
};

};
    
const ll inf = 5e15;

struct M {
    ll v;

    M(ll v = -inf) : v(v) { }

    static M merge(M a, M b) {
        return M(std::max(a.v, b.v));
    }
};

int main() {
    ll n;
    std::cin >> n;
    vec<pll> xy(n);
    vec<ll> xyl;
    for (auto &[ x, y ] : xy) {
        std::cin >> x >> y;
        xyl.push_back(x);
        xyl.push_back(y);
    }
    
    utility::Compressor cmp(xyl);
    
    segtree::SegmentTree<M> seg1([&](ll) { return M(); }, cmp.size() + 10);
    auto seg2 = seg1;
    ll ans = 0;
    std::sort(ALL(xy));

    {
        std::map<ll, vec<ll>> mp;
        for (auto [ x, y ] : xy) mp[x].push_back(y);
        for (auto &[ x, yv ] : mp) {
            std::sort(ALL(yv));
            chmax(ans, yv.back() - yv.front());
        }
    }

    for (auto [ x, y ] : xy) {
        ll yid = cmp.get(y);
        {
            ll v = seg1.get_query(0, yid + 1).v;
            chmax(ans, v + x + y);
        }
        {
            ll v = seg2.get_query(yid + 1, cmp.size() + 10).v;
            chmax(ans, v + x - y);
        }

        if (seg1[yid].v < -x - y) seg1.update_query(yid, M(-x - y));
        if (seg2[yid].v < -x + y) seg2.update_query(yid, M(-x + y));
    }

    std::cout << ans << "\n";
    return 0;
}


Measured memory_bytes: 50892