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

template<class T>
bool chmax(T& a, const T& b) {
    if (a < b) { a = b; return true; }
    return false;
}
template<class T>
bool chmin(T& a, const T& b) {
    if (b < a) { a = b; return true; }
    return false;
}

// std::vector Declaration
template<typename T>
vector<T> make_v(size_t a) { return vector<T>(a); }
template<typename T, typename... Ts>
auto make_v(size_t a, Ts... ts) {
    return vector<decltype(make_v<T>(ts...))>(a, make_v<T>(ts...));
}

// std::vector Declaration and Initialization
template<typename T>
vector<T> make_vector(size_t a, T x) { return vector<T>(a, x); }
template<typename T, typename U, typename... Ts>
auto make_vector(size_t a, U b, Ts... ts) {
    return vector<decltype(make_vector<T>(b,ts...))>(a, make_vector<T>(b, ts...));
}

// std::vector Input
template<typename T>
istream& operator>>(istream& is, vector<T>& v) {
    for (auto &e : v) is >> e;
    return is;
}

// std::vector Debug
template<typename T>
ostream& operator<<(ostream& os, const vector<T>& v) {
    os << "[";
    bool a = 1;
    for (auto e : v) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "]";
    return os;
}

// std::array Debug
template<typename T, size_t n>
ostream& operator<<(ostream& os, const array<T, n>& v) {
    os << "[";
    bool a = 1;
    for (auto e : v) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "]";
    return os;
}

// std::deque Debug
template<typename T>
ostream& operator<<(ostream& os, const deque<T>& d) {
    os << "[";
    bool a = 1;
    for (auto e : d) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "]";
    return os;
}

// std::pair Debug
template<typename T, typename U>
ostream& operator<<(ostream& os, const pair<T, U>& p) {
    os << "(" << p.first << " " << p.second << ")";
    return os;
}

// std::set Debug
template<typename T>
ostream& operator<<(ostream& os, const set<T>& st) {
    os << "{";
    bool a = 1;
    for (auto e : st) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "}";
    return os;
}

// std::multiset Debug
template<typename T>
ostream& operator<<(ostream& os, const multiset<T>& st) {
    os << "{";
    bool a = 1;
    for (auto e : st) {
        os << (a ? "" : " ");
        os << e;
        a = 0;
    }
    os << "}";
    return os;
}

// std::map Debug
template<typename T, typename U>
ostream& operator<<(ostream& os, const map<T, U>& mp) {
    os << "{";
    bool a = 1;
    for (auto e : mp) {
        os << (a ? "" : " ");
        os << e.first << ":" << e.second;
        a = 0;
    }
    os << "}";
    return os;
}

// std::tuple Debug
template<int N, class Tuple>
void out(ostream& os, const Tuple& t){}
template<int N, class Tuple, class H, class ...Ts>
void out(ostream& os, const Tuple& t) {
    if (N) os << " ";
    os << get<N>(t);
    out<N+1,Tuple,Ts...>(os, t);
}
template<class ...Ts>
ostream& operator<<(ostream& os, const tuple<Ts...>& t) {
    os << "(";
    out<0,tuple<Ts...>,Ts...>(os, t);
    os << ")";
    return os;
}

// Debug
#define DUMP(x) cerr<<#x<<" = "<<(x)<<endl

// Weighted edge
template<typename T>
struct edge {
    int src, to;
    T cost;

    edge() {}
    edge(int to, T cost) : src(-1), to(to), cost(cost) {}
    edge(int src, int to, T cost) : src(src), to(to), cost(cost) {}

    friend ostream& operator<<(ostream& os, const edge& e) {
        return os << "(" << e.src << "->" << e.to << ":" << e.cost << ")";
    }
};

using LL = int64_t;

#define fs first
#define sc second

const int64_t MOD = 1e9+7;

int dy[] = {0, 1, 0, -1},
    dx[] = {-1, 0, 1, 0};

int main()
{
    cin.tie(0);
    ios::sync_with_stdio(false);
    cout << fixed << setprecision(10);

    while (true) {
        int n; cin >> n;
        if (n == 0) break;
        vector<LL> x(n), y(n);
        for (int i = 0; i < n; ++i) {
            cin >> x[i] >> y[i];
        }
        map<LL,int> compx, compy;
        for (int i = 0; i < n; ++i) {
            compx[x[i]] = -1;
            compy[y[i]] = -1;
        }
        int cntx = 0, cnty = 0;
        for (auto& tp : compx) {
            tp.second = cntx++;
        }
        for (auto& tp : compy) {
            tp.second = cnty++;
        }

        vector<LL> posx, posy;
        for (const auto& tp : compx) {
            posx.push_back(tp.first);
        }
        for (const auto& tp : compy) {
            posy.push_back(tp.first);
        }

        LL l = 20000, r = -20000, t = -20000, b = 20000;
        for (int k = 0; k < 4; ++k) {
            LL p, q; cin >> p >> q;
            chmax(r, p); chmin(l, p);
            chmax(t, q); chmin(b, q);
        }

        auto sumy = make_v<int>(cnty, cntx + 1),
             sumx = make_v<int>(cnty + 1, cntx);
        for (int i = 0; i < n; ++i) {
            int px = compx[x[i]], qx = compx[x[(i+1)%n]],
                py = compy[y[i]], qy = compy[y[(i+1)%n]];
            if (px == qx) {
                if (py > qy) swap(py, qy);
                for (int t = py; t < qy; ++t) {
                    sumy[t][px + 1] += 1;
                }
            }
            else {
                if (px > qx) swap(px, qx);
                for (int t = px; t < qx; ++t) {
                    sumx[py + 1][t] += 1;
                }
            }
        }

        for (int i = 0; i < cnty; ++i) {
            for (int j = 0; j < cntx; ++j) {
                sumy[i][j+1] += sumy[i][j];
                sumx[i+1][j] += sumx[i][j];
            }
        }

        LL ans = 0;
        for (int i = 0; i < cntx - 1; ++i) {
            for (int j = 0; j < cnty - 1; ++j) {
                if (sumx[j+1][i] & 1 and sumy[j][i+1] & 1) {
                    LL px = posx[i], py = posy[j],
                       qx = posx[i+1], qy = posy[j+1];

                    LL h = max(min(t, qy) - max(b, py), (LL)0),
                       w = max(min(r, qx) - max(l, px), (LL)0);

                    ans += (qx - px) * (qy - py) - h * w;
                }
            }
        }
        cout << ans << endl;
    }

    return 0;
}



Measured memory_bytes: 3176