#include <iostream>
#include <vector>
#include <set>


using namespace std;

struct event {
    int type; // 1 - прибытие 0 -отправление
    int time_1;
    int time_2;
    int station;

    event(int type, int time_1, int time_2, int station) : type(type), time_1(time_1), time_2(time_2), station(station) {}


};
bool operator <(event const& a, event const& other) {
    return a.time_1 < other.time_1 || (a.time_1 == other.time_1 && a.type > other.type);
}

int main()
{
    int t;
    cin >> t;

    int n;
    cin >> n;

    set<event> arr;
    vector<int> train1;
    vector<int> train2;



    for (int i = 0; i < n; i++) {
        int a, b;
        cin >> a >> b;
        arr.insert(event(0, a, b, 1));
    }

    int m;
    cin >> m;

    for (int i = 0; i < m; i++) {
        int a, b;
        cin >> a >> b;
        arr.insert(event(0, a, b, 2));
    }

    while (!arr.empty()) {
        event cur = *arr.begin();
        arr.erase(arr.begin());

        if (cur.type == 0) {
            if (cur.station == 1) {
                if ((int)train1.size() > 0) {
                    arr.insert(event(1, cur.time_2 + t, -1, 2));
                    train1.pop_back();
                }
                else {
                    train1.push_back(0);
                    arr.insert(event(1, cur.time_2 + t, -1, 2));
                    train1.erase(train1.begin());
                }
            }
            else {
                if ((int)train2.size() > 0) {
                    arr.insert(event(1, cur.time_2 + t, -1, 1));
                    train2.pop_back();
                }
                else {

                    arr.insert(event(1, cur.time_2 + t, -1, 1));
                }
            }

        }
        else {
            if (cur.station == 1) {
                train1.push_back(0);
            }
            else {
                train2.push_back(0);
            }
        }
    }

    int res = train1.size() + train2.size();

    cout << res << endl;


}