import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.NoSuchElementException;

public class Main {
	public static void main(String[] args) throws FileNotFoundException {
		long t = System.currentTimeMillis();
		new Main().run();
		System.err.println(System.currentTimeMillis() - t);
	}
	
	double[][] mul(double[][] a,double[][] b){
		double[][] ret=new double[a.length][b[0].length];
		for(int i=0;i<a.length;++i) {
			for(int j=0;j<b[i].length;++j) {
				for(int k=0;k<a[i].length;++k) {
					ret[i][j]+=a[i][k]*b[k][j];
				}
			}
		}
		return ret;
	}
	
	//return det(M_{ij})
	double detM(double[][] A,int i,int j) {
		int n=A.length;
		int p=0;
		double[][] ret=new double[n][n];
		for(int h=0;h<n;++h) {
			if(h==i)continue;
			int q=0;
			for(int w=0;w<n;++w) {
				if(w==j)continue;
				ret[p][q++]+=A[h][w];
			}
			++p;
		}
		return ret[0][0]*ret[1][1]-ret[0][1]*ret[1][0];
	}
	
	double[][] inv(double[][] A){
		int n=A.length;
		double[][] ret=new double[n][n];
		for(int i=0;i<n;++i) {
			for(int j=0;j<n;++j) {
				ret[i][j]+=((i+j)%2==0?1:(-1))*detM(A,j,i);
			}
		}
		double det=0;
		for(int shift=0;shift<3;++shift) {
			double plus=1,minus=1;
			for(int i=0;i<3;++i)plus*=A[(i+shift)%n][i];
			for(int i=0;i<3;++i)minus*=A[(i+shift)%n][(n-i)%n];
			det+=plus-minus;
		}
		for(int i=0;i<n;++i)
			for(int j=0;j<n;++j)
				ret[i][j]/=det;
		return ret;
	}
	
	double[] vector_product(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() {
		FastScanner sc = new FastScanner();
		double[][] e=new double[3][3];
		for(int i=0;i<3;++i) {
			for(int j=0;j<3;++j) {
				e[i][j]=sc.nextLong();
			}
		}
		double[] v=new double[3];
		for(int i=0;i<v.length;++i)v[i]=sc.nextInt();
		for(int i=0;i<3;++i)v[i]-=e[2][i];
		for(int i=0;i<3;++i) {
			for(int j=0;j<3;++j) {
				e[i][j]-=e[2][j];
			}
		}
		e[2]=vector_product(e[0], e[1]);
		double[][] ret=mul(new double[][] {{v[0],v[1],v[2]}},inv(e));
		System.out.println(0<=ret[0][0]&&0<=ret[0][1]&&ret[0][0]+ret[0][1]<=1?"YES":"NO");
	}

	
	static void tr(Object... objects) {
		System.out.println(Arrays.deepToString(objects));
	}

}
	
	
class FastScanner {
    private final InputStream in = System.in;
    private final byte[] buffer = new byte[1024];
    private int ptr = 0;
    private int buflen = 0;
    private boolean hasNextByte() {
        if (ptr < buflen) {
            return true;
        }else{
            ptr = 0;
            try {
                buflen = in.read(buffer);
            } catch (IOException e) {
                e.printStackTrace();
            }
            if (buflen <= 0) {
                return false;
            }
        }
        return true;
    }
    private int readByte() { if (hasNextByte()) return buffer[ptr++]; else return -1;}
    private static boolean isPrintableChar(int c) { return 33 <= c && c <= 126;}
    private void skipUnprintable() { while(hasNextByte() && !isPrintableChar(buffer[ptr])) ptr++;}
    public boolean hasNext() { skipUnprintable(); return hasNextByte();}
    public String next() {
        if (!hasNext()) throw new NoSuchElementException();
        StringBuilder sb = new StringBuilder();
        int b = readByte();
        while(isPrintableChar(b)) {
            sb.appendCodePoint(b);
            b = readByte();
        }
        return sb.toString();
    }
    public long nextLong() {
        if (!hasNext()) throw new NoSuchElementException();
        long n = 0;
        boolean minus = false;
        int b = readByte();
        if (b == '-') {
            minus = true;
            b = readByte();
        }
        if (b < '0' || '9' < b) {
            throw new NumberFormatException();
        }
        while(true){
            if ('0' <= b && b <= '9') {
                n *= 10;
                n += b - '0';
            }else if(b == -1 || !isPrintableChar(b)){
                return minus ? -n : n;
            }else{
                throw new NumberFormatException();
            }
            b = readByte();
        }
    }
    
    public int nextInt() {
    	return (int)nextLong();
    }
}