#include <bits/stdc++.h>
using namespace std;
using ll = long long;
struct BIT {
vector<int> tree;
int N;
void init(int x) {
N = x;
tree = vector(N + 1, 0);
}
void add(int x, int y) {
while (x <= N) {
tree[x] += y;
x += x & -x;
}
}
int query(int x) {
int res = 0;
while (x) {
res += tree[x];
x -= x & -x;
}
return res;
}
} bit;
struct SegTree {
vector<pair<int, int>> tree;
int N;
void init(int x) {
N = x;
tree = vector<pair<int, int>>(N * 4 + 1);
}
void build(vector<pair<int, int>> &v) {
build(1, 1, N, v);
}
void build(int node, int s, int e, vector<pair<int, int>> &v) {
if (s == e) {
tree[node] = {v[s].first, s};
return;
}
int mid = (s + e) / 2;
build(node * 2, s, mid, v);
build(node * 2 + 1, mid + 1, e, v);
tree[node] = min(tree[node * 2], tree[node * 2 + 1]);
}
int query(int l, int r) {
return query(1, 1, N, l, r).second;
}
pair<int, int> query(int node, int s, int e, int l, int r) {
if (e < l || r < s)
return {2e9, 0};
if (l <= s && e <= r)
return tree[node];
int mid = (s + e) / 2;
return min(query(node * 2, s, mid, l, r), query(node * 2 + 1, mid + 1, e, l, r));
}
} seg_tree;
int main() {
ios::sync_with_stdio(false);
cin.tie(nullptr);
int N;
cin >> N;
vector<pair<int, int>> A(N / 2 + 1);
ll ans1 = 0;
int px = 0, py = 0;
for (int i = 1, x1, y1, x2, y2; i <= N / 2; i++) {
cin >> x1 >> y1 >> x2 >> y2;
A[i] = {y2, x1};
ans1 += 1LL * (x1 - px) * py;
px = x1, py = y2;
}
seg_tree.init(N / 2);
seg_tree.build(A);
double ans2 = 0;
auto f = [&](auto&& self, int s, int e, int v) -> void {
if (s > e)
return;
int c = bit.query(e) - bit.query(s - 1);
if (c == 0)
return;
int idx = seg_tree.query(s, e);
ll w = 1LL * (A[idx].first - v) * (A[e + 1].second - A[s].second);
ans1 -= w;
ans2 += (double)w / c;
self(self, s, idx - 1, A[idx].first);
self(self, idx + 1, e, A[idx].first);
};
int K;
cin >> K;
bit.init(N / 2);
for (int i = 0; i < K; i++) {
int x1, y1, x2, y2;
cin >> x1 >> y1 >> x2 >> y2;
int s = 1, e = N / 2;
while (s <= e) {
int mid = (s + e) / 2;
if (x1 <= A[mid].second)
e = mid - 1;
else
s = mid + 1;
}
bit.add(s, 1);
}
f(f, 1, N / 2 - 1, 0);
cout << ans1 << "\n";
}
