#include <bits/stdc++.h>
#define range(i, l, r) for(long long int (i) = (l); (i) < (r); (i)++)
#define reversed_range(i, l, r) for (long long int (i) = (r) - 1; (i) >= l; (i)--)
using namespace std;
template <typename T>
using vec = vector<T>;
using lint = long long;
using ulint = unsigned long long;
using pint = pair<int, int>;
using plint = pair<lint, lint>;

template <typename S, typename T>
ostream& operator <<(ostream& os, pair<S, T> p) {
    os << "(";
    os << p.first << ", " << p.second;
    return os << ")";
}

template <typename T>
ostream& operator <<(ostream& os, vec<T> v) {
    os << "[";
    if (v.size() == 0) return os << "]";
    for (int i = 0; i < v.size() - 1; i++) {
        os << v.at(i) << ", ";
    }
    return os << v.at(v.size() - 1) << "]";
}

template <typename T>
ostream& operator <<(ostream& os, set<T>& s) {
    os << "{";
    if (s.begin() == s.end()) return os << "}";
    auto it_first_item = s.begin();
    cout << *it_first_item;
    for (auto it = ++it_first_item; it != s.end(); it++) {
        cout << ", " << *it;
    }
    return cout << "}";
}

template <typename T>
ostream& operator <<(ostream& os, unordered_set<T>& s) {
    os << "{";
    if (s.begin() == s.end()) return os << "}";
    auto it_first_item = s.begin();
    cout << *it_first_item;
    for (auto it = ++it_first_item; it != s.end(); it++) {
        cout << ", " << *it;
    }
    return cout << "}";
}

template <typename K, typename V>
ostream& operator <<(ostream& os, map<K, V> m) {
    os << "{";
    if (m.begin() == m.end()) return os << "}";
    auto it_first_item = m.begin();
    cout << it_first_item->first << ": " << it_first_item->second;
    for (auto it = ++it_first_item; it != m.end(); it++) {
        cout << ", " << it->first << ": " << it->second;
    }
    return os << "}";
}

template <typename K, typename V>
ostream& operator <<(ostream& os, unordered_map<K, V> m) {
    os << "{";
    if (m.begin() == m.end()) return os << "}";
    auto it_first_item = m.begin();
    cout << it_first_item->first << ": " << it_first_item->second;
    for (auto it = ++it_first_item; it != m.end(); it++) {
        cout << ", " << it->first << ": " << it->second;
    }
    return os << "}";
}

lint pow(lint num, lint e, lint MOD) {
    lint res = 1;
    lint cur_num = num;
    while (e) {
        if (e & 1) {
            res *= cur_num;
            res %= MOD;
        }
        cur_num *= cur_num;
        cur_num %= MOD;
        e >>= 1;
    }
    return res;
}

int main() {
    cin.tie(0); cout.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);
    lint N; cin >> N;
    vec<plint> red_points(N), blue_points(N);
    range(i, 0, N) {
        lint a, b; cin >> a >> b;
        red_points.at(i) = {a, b};
    }
    range(i, 0, N) {
        lint a, b; cin >> a >> b;
        blue_points.at(i) = {a, b};
    }
    using Point = pair<char, lint>;
    vec<Point> points(2 * N);
    for (const auto& red_point : red_points) {
        points.at(red_point.first) = {'r', red_point.second};
    }
    for (const auto& blue_point : blue_points) {
        points.at(blue_point.first) = {'b', blue_point.second};
    }
    vec<lint> y_coords_red;
    lint ans = 0;
    range(x, 0, 2 * N) {
        Point p = points.at(x);
        if (p.first == 'r') y_coords_red.emplace_back(p.second);
        else {
            lint max_possible_y = -1, idx = -1;
            range(i, 0, y_coords_red.size()) {
                lint y = y_coords_red.at(i);
                if (y > max_possible_y and y < p.second) {
                    idx = i;
                    max_possible_y = y;
                }
            }
            if (max_possible_y != -1) {
                ans += 1;
                y_coords_red.erase(y_coords_red.begin() + idx);
            }
        }
    }
    cout << ans << "\n";
}

Measured memory_bytes: 256