package adv2017;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.Arrays;
import java.util.InputMismatchException;

public class N622_2 {
	InputStream is;
	PrintWriter out;
	String INPUT = "";
	
	void solve()
	{
		double[][] co = new double[4][];
		for(int i = 0;i < 4;i++){
			co[i] = new double[3];
			for(int j = 0;j < 3;j++){
				co[i][j] = nl();
			}
		}
		for(int i = 1;i < 4;i++){
			for(int j = 0;j < 3;j++){
				co[i][j] -= co[0][j];
			}
		}
		double[] N = cross(co[1], co[2]);
		double[][] M = new double[3][3];
		double[] v = new double[3];
		for(int i = 0;i < 3;i++){
			M[i][0] = co[1][i];
			M[i][1] = co[2][i];
			M[i][2] = N[i];
			v[i] = co[3][i];
		}
		
		double[] x = solve3x3(M, v);
		
		out.println(x[0]+x[1] <= 1 && x[0] >= 0 && x[1] >= 0 ? "YES" : "NO");
	}
	
	public static double[] solve3x3(double[][] M, double[] V)
	{
		double EPS = 1E-10;
		double det = det3(M);
		if(Math.abs(det) < EPS)return null;
		int n = M.length;
		double[] OM = new double[n];
		double[] ret = new double[n];
		for(int j = 0;j < n;j++){
			for(int i = 0;i < n;i++){ OM[i] = M[j][i]; M[j][i] = V[i]; }
			ret[j] = det3(M)/det;
			for(int i = 0;i < n;i++){ M[j][i] = OM[i]; }
		}
		return ret;
	}
	
	public static double det3(double[][] M)
	{
		return M[0][0]*M[1][1]*M[2][2]
				-M[0][1]*M[1][0]*M[2][2]
				-M[0][0]*M[1][2]*M[2][1]
				-M[0][2]*M[1][1]*M[2][0]
				+M[1][0]*M[2][1]*M[0][2]
				+M[0][1]*M[1][2]*M[2][0];
	}

	
	public static double[] cross(double[] a, double[] b)
	{
		return new double[]{
				a[1]*b[2]-a[2]*b[1],
				a[2]*b[0]-a[0]*b[2],
				a[0]*b[1]-a[1]*b[0]
		};
	}
	
	

	
	void run() throws Exception
	{
		is = INPUT.isEmpty() ? System.in : new ByteArrayInputStream(INPUT.getBytes());
		out = new PrintWriter(System.out);
		
		long s = System.currentTimeMillis();
		solve();
		out.flush();
		if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//		Thread t = new Thread(null, null, "~", Runtime.getRuntime().maxMemory()){
//			@Override
//			public void run() {
//				long s = System.currentTimeMillis();
//				solve();
//				out.flush();
//				if(!INPUT.isEmpty())tr(System.currentTimeMillis()-s+"ms");
//			}
//		};
//		t.start();
//		t.join();
	}
	
	public static void main(String[] args) throws Exception { new N622_2().run(); }
	
	private byte[] inbuf = new byte[1024];
	public int lenbuf = 0, ptrbuf = 0;
	
	private int readByte()
	{
		if(lenbuf == -1)throw new InputMismatchException();
		if(ptrbuf >= lenbuf){
			ptrbuf = 0;
			try { lenbuf = is.read(inbuf); } catch (IOException e) { throw new InputMismatchException(); }
			if(lenbuf <= 0)return -1;
		}
		return inbuf[ptrbuf++];
	}
	
	private boolean isSpaceChar(int c) { return !(c >= 33 && c <= 126); }
	private int skip() { int b; while((b = readByte()) != -1 && isSpaceChar(b)); return b; }
	
	private double nd() { return Double.parseDouble(ns()); }
	private char nc() { return (char)skip(); }
	
	private String ns()
	{
		int b = skip();
		StringBuilder sb = new StringBuilder();
		while(!(isSpaceChar(b))){ // when nextLine, (isSpaceChar(b) && b != ' ')
			sb.appendCodePoint(b);
			b = readByte();
		}
		return sb.toString();
	}
	
	private char[] ns(int n)
	{
		char[] buf = new char[n];
		int b = skip(), p = 0;
		while(p < n && !(isSpaceChar(b))){
			buf[p++] = (char)b;
			b = readByte();
		}
		return n == p ? buf : Arrays.copyOf(buf, p);
	}
	
	private int[] na(int n)
	{
		int[] a = new int[n];
		for(int i = 0;i < n;i++)a[i] = ni();
		return a;
	}
	
	private long[] nal(int n)
	{
		long[] a = new long[n];
		for(int i = 0;i < n;i++)a[i] = nl();
		return a;
	}
	
	private char[][] nm(int n, int m) {
		char[][] map = new char[n][];
		for(int i = 0;i < n;i++)map[i] = ns(m);
		return map;
	}
	
	private int[][] nmi(int n, int m) {
		int[][] map = new int[n][];
		for(int i = 0;i < n;i++)map[i] = na(m);
		return map;
	}
	
	private int ni() { return (int)nl(); }
	
	private long nl()
	{
		long num = 0;
		int b;
		boolean minus = false;
		while((b = readByte()) != -1 && !((b >= '0' && b <= '9') || b == '-'));
		if(b == '-'){
			minus = true;
			b = readByte();
		}
		
		while(true){
			if(b >= '0' && b <= '9'){
				num = num * 10 + (b - '0');
			}else{
				return minus ? -num : num;
			}
			b = readByte();
		}
	}
	
	private static void tr(Object... o) { System.out.println(Arrays.deepToString(o)); }
}