#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;
    while (n--)
    {
        int x, y; cin >> 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;
    if((x > x_min && x < x_max) && (y > y_min && y < y_max)) {
        cout << "YES"  << endl;
    }
    else {
        cout << "NO" << endl;
    }
    
}