public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int N = sc . nextInt ( ) ;
  int X = sc . nextInt ( ) ;
  w = new int [ N ] ;
  for ( int i = 0 ;
  i < N ;
  i ++ ) {
    w [ i ] = sc . nextInt ( ) ;
  }
  a = N / 2 ;
  int ans = 0 ;
  pack ( 0 , a , left , 0 ) ;
  pack ( a , N , right , 0 ) ;
  for ( int c : left . keySet ( ) ) {
    if ( right . containsKey ( X - c ) ) {
      ans += left . get ( c ) * right . get ( X - c ) ;
    }
  }
  System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int N = sc . nextInt ( ) ; int X = sc . nextInt ( ) ; w = new int [ N ] ; for ( int i = 0 ; i < N ; i ++ ) { w [ i ] = sc . nextInt ( ) ; } a = N / 2 ; int ans = 0 ; pack ( 0 , a , left , 0 ) ; pack ( a , N , right , 0 ) ; for ( int c : left . keySet ( ) ) { if ( right . containsKey ( X - c ) ) { ans += left . get ( c ) * right . get ( X - c ) ; } } System . out . println ( ans ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (expression_statement (assignment_expression left: (identifier) right: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (identifier)) update: (update_expression (identifier)) body: (block (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier) (identifier) (decimal_integer_literal)))) (expression_statement (method_invocation name: (identifier) arguments: (argument_list (identifier) (identifier) (identifier) (decimal_integer_literal)))) (enhanced_for_statement type: (integral_type) name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) body: (block (if_statement condition: (parenthesized_expression (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (identifier))))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier))))))