#include <iostream>
using namespace std;

int main()
{
    double x1, y1, x2, y2, x3, y3, xp, yp;

    while (cin >> x1 >> y1 >> x2 >> y2 >> x3 >> y3 >> xp >> yp) {
        if (
                (
                    ((x1 < xp && xp < x2) || (x2 < xp && xp < x1)) &&
                    ((y1 < yp && yp < y2) || (y2 < yp && yp < y1))
                ) || (
                    ((x2 < xp && xp < x3) || (x3 < xp && xp < x2)) &&
                    ((y2 < yp && yp < y3) || (y3 < yp && yp < y2))
                ) || (
                    ((x3 < xp && xp < x1) || (x1 < xp && xp < x3)) &&
                    ((y3 < yp && yp < y1) || (y1 < yp && yp < y3))
                )
           ) {
            cout << "YES" << endl;
        } else {
            cout << "NO" << endl;
        }
    }

    return 0;
}