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

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

    int x_min = INT_MAX, x_max = INT_MIN;
    int y_min = INT_MAX, y_max = INT_MIN;
    vector<pair<int, int>> v;
    while (n--)
    {
        int x, y;
        cin >> x >> y;
        v.push_back({x, y});
        x_min = min(x, x_min);
        x_max = max(x, x_max);
        y_min = min(y, y_min);
        y_max = max(y, y_max);
    }
    int x, y;
    cin >> x >> y;

    int flag = 0;
    for (auto &i : v)
    {
        if (i.first == x && i.second == y)
        {
            cout << "YES" << endl;
            return 0;
        }
    }

   

    if ((x > x_min && x < x_max) && (y > y_min && y < y_max))
    {
        cout << "YES" << endl;
    }
    else if ((x_max == x_min && x == x_min) || (y_max == y_min && y == y_min))
    {
        cout << "YES" << endl;
    }
    else
    {
        cout << "NO" << endl;
    }
}