using System;
using static System.Console;
using System.Linq;
using System.Collections.Generic;

class Program
{
    static int NN => int.Parse(ReadLine());
    static double[] NList => ReadLine().Split().Select(double.Parse).ToArray();
    public static void Main()
    {
        Solve();
    }
    static void Solve()
    {
        var a = NList;
        var b = NList;
        var c = NList;
        var d = NList;
        var oa = new double[3];
        var ob = new double[3];
        for (var i = 0; i < 3; ++i)
        {
            oa[i] = b[i] - a[i];
            ob[i] = c[i] - a[i];
        }
        var op = OuterProduct(oa, ob);
        {
            var div = Len(oa, new double[3]) * Len(ob, new double[3]);
            op = (op.ox / div, op.oy / div, op.oz / div);
        }
        var left = -2_000_000.0;
        var right = 2_000_000.0;
        while (right - left > 0.001)
        {
            var mid1 = (left * 2 + right) / 3;
            var mid2 = (left + right * 2) / 3;
            var a1 = new double[] { a[0] + op.ox * mid1, a[1] + op.oy * mid1, a[2] + op.oz * mid1 };
            var a2 = new double[] { a[0] + op.ox * mid2, a[1] + op.oy * mid2, a[2] + op.oz * mid2 };
            var len1 = Len(a1, d);
            var len2 = Len(a2, d);
            if (len1 < len2) right = mid2;
            else left = mid1;
        }
        var lr = (left + right) / 2;
        d[0] -= op.ox * lr;
        d[1] -= op.oy * lr;
        d[2] -= op.oz * lr;
        var abc = Area(a, b, c);
        var abcd = Area(a, b, d) + Area(b, c, d) + Area(c, a, d);
        WriteLine(abcd - abc > 0.0005 ? "NO" : "YES");
    }
    static double Area(double[] a, double[] b, double[] c)
    {
        var al = Len(a, b);
        var bl = Len(b, c);
        var cl = Len(c, a);
        var s = (al + bl + cl) / 2;
        return Math.Sqrt(s * (s - al) * (s - bl) * (s - cl));
    }
    static (double ox, double oy, double oz) OuterProduct(double[] a, double[] b)
    {
        return (a[1] * b[2] - a[2] * b[1], a[2] * b[0] - a[0] * b[2], a[0] * b[1] - a[1] * b[0]);
    }
    static double Len(double[] a, double[] b)
    {
        return Math.Sqrt((a[0] - b[0]) * (a[0] - b[0]) + (a[1] - b[1]) * (a[1] - b[1]) + (a[2] - b[2]) * (a[2] - b[2]));
    }
}