source_code: import java.io.BufferedReader;
  import java.io.IOException;
  import java.io.InputStreamReader;
  import java.util.StringTokenizer;
   
  /**
   *
   * @author Antonio "Teo" Alurralde
   */
  public class Main {
    public static void main(String[] args) throws IOException {
      BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
      int n = Integer.parseInt(br.readLine());
      StringTokenizer tok = new StringTokenizer(br.readLine());
      int ax = Integer.parseInt(tok.nextToken());
      int ay = Integer.parseInt(tok.nextToken());
      tok = new StringTokenizer(br.readLine());
      int bx = Integer.parseInt(tok.nextToken());
      int by = Integer.parseInt(tok.nextToken());
      tok = new StringTokenizer(br.readLine());
      int cx = Integer.parseInt(tok.nextToken());
      int cy = Integer.parseInt(tok.nextToken());
      boolean ans = (bx < ax && cx < ax && by < ay && cy < ay) ||
      (bx < ax && cx < ax && by > ay && cy > ay) ||
      (bx > ax && cx > ax && by < ay && cy < ay) ||
      (bx > ax && cx > ax && by > ay && cy > ay);
      System.out.print(ans?"YES":"NO");
    }
  }
  