static int AVLtree ( int H , int a , int b ) {
  if ( H == 0 ) return 1 ;
  if ( H == 1 ) return b ;
  return AVLtree ( H - 1 , b , a + b + 1 ) ;
}

static int AVLtree ( int H , int a , int b ) { if ( H == 0 ) return 1 ; if ( H == 1 ) return b ; return AVLtree ( H - 1 , b , a + b + 1 ) ; }
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