public static void main ( String [ ] args ) {
  Scanner sc = new Scanner ( System . in ) ;
  int n = sc . nextInt ( ) ;
  int w = sc . nextInt ( ) ;
  int [ ] capacity = new int [ n * 2 ] ;
  for ( int i = 0 ;
  i < n * 2 ;
  i ++ ) {
    capacity [ i ] = sc . nextInt ( ) ;
  }
  Arrays . sort ( capacity ) ;
  double m = Math . min ( capacity [ 0 ] , ( double ) capacity [ n ] / 2 ) ;
  double total = 3 * m * n ;
  System . out . println ( Math . min ( total , w ) ) ;
}

public static void main ( String [ ] args ) { Scanner sc = new Scanner ( System . in ) ; int n = sc . nextInt ( ) ; int w = sc . nextInt ( ) ; int [ ] capacity = new int [ n * 2 ] ; for ( int i = 0 ; i < n * 2 ; i ++ ) { capacity [ i ] = sc . nextInt ( ) ; } Arrays . sort ( capacity ) ; double m = Math . min ( capacity [ 0 ] , ( double ) capacity [ n ] / 2 ) ; double total = 3 * m * n ; System . out . println ( Math . min ( total , w ) ) ; }
(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)))) (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (binary_expression left: (identifier) right: (decimal_integer_literal)))))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal))) 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 (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier)))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)) (binary_expression left: (cast_expression type: (floating_point_type) value: (array_access array: (identifier) index: (identifier))) right: (decimal_integer_literal)))))) (local_variable_declaration type: (floating_point_type) declarator: (variable_declarator name: (identifier) value: (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (identifier)) right: (identifier)))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier) (identifier))))))))