public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int [ ] arr = new int [ 6 ] ;
  for ( int i = 0 ;
  i < 6 ;
  i ++ ) {
    arr [ i ] = sc . nextInt ( ) ;
  }
  int a1 = arr [ 0 ] ;
  int a2 = arr [ 1 ] ;
  int a3 = arr [ 2 ] ;
  int a5 = arr [ 4 ] ;
  System . out . println ( ( a1 + a2 + a3 ) * ( a1 + a2 + a3 ) - a1 * a1 - a3 * a3 - a5 * a5 ) ;
  sc . close ( ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int [ ] arr = new int [ 6 ] ; for ( int i = 0 ; i < 6 ; i ++ ) { arr [ i ] = sc . nextInt ( ) ; } int a1 = arr [ 0 ] ; int a2 = arr [ 1 ] ; int a3 = arr [ 2 ] ; int a5 = arr [ 4 ] ; System . out . println ( ( a1 + a2 + a3 ) * ( a1 + a2 + a3 ) - a1 * a1 - a3 * a3 - a5 * a5 ) ; sc . close ( ) ; }
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