public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int x1 = sc . nextInt ( ) ;
  int y1 = sc . nextInt ( ) ;
  int x2 = sc . nextInt ( ) ;
  int y2 = sc . nextInt ( ) ;
  int x3 = sc . nextInt ( ) ;
  int y3 = sc . nextInt ( ) ;
  x2 -= x1 ;
  x3 -= x1 ;
  y2 -= y1 ;
  y3 -= y1 ;
  System . out . println ( MyMath . area_of_triangle ( new Point ( x2 , y2 ) , new Point ( x3 , y3 ) ) ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int x1 = sc . nextInt ( ) ; int y1 = sc . nextInt ( ) ; int x2 = sc . nextInt ( ) ; int y2 = sc . nextInt ( ) ; int x3 = sc . nextInt ( ) ; int y3 = sc . nextInt ( ) ; x2 -= x1 ; x3 -= x1 ; y2 -= y1 ; y3 -= y1 ; System . out . println ( MyMath . area_of_triangle ( new Point ( x2 , y2 ) , new Point ( x3 , y3 ) ) ) ; }
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