public static void main ( String [ ] args ) {
  FastReader fr = new FastReader ( ) ;
  Scanner sc = new Scanner ( System . in ) ;
  int n = fr . nextInt ( ) ;
  int [ ] ar = new int [ n ] ;
  int total = 0 ;
  for ( int i = 0 ;
  i < n ;
  i ++ ) {
    ar [ i ] = fr . nextInt ( ) ;
    total += ar [ i ] ;
  }
  int alice = ar [ 0 ] ;
  ArrayList < Integer > ans = new ArrayList < > ( ) ;
  ans . add ( 1 ) ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) {
    if ( alice > total / 2 ) break ;
    if ( 2 * ar [ i ] <= ar [ 0 ] ) {
      alice += ar [ i ] ;
      ans . add ( i + 1 ) ;
    }
  }
  if ( alice > total / 2 ) {
    System . out . println ( ans . size ( ) ) ;
    for ( Integer i : ans ) System . out . print ( i + " " ) ;
  }
  else System . out . println ( 0 ) ;
}

public static void main ( String [ ] args ) { FastReader fr = new FastReader ( ) ; Scanner sc = new Scanner ( System . in ) ; int n = fr . nextInt ( ) ; int [ ] ar = new int [ n ] ; int total = 0 ; for ( int i = 0 ; i < n ; i ++ ) { ar [ i ] = fr . nextInt ( ) ; total += ar [ i ] ; } int alice = ar [ 0 ] ; ArrayList < Integer > ans = new ArrayList < > ( ) ; ans . add ( 1 ) ; for ( int i = 1 ; i < n ; i ++ ) { if ( alice > total / 2 ) break ; if ( 2 * ar [ i ] <= ar [ 0 ] ) { alice += ar [ i ] ; ans . add ( i + 1 ) ; } } if ( alice > total / 2 ) { System . out . println ( ans . size ( ) ) ; for ( Integer i : ans ) System . out . print ( i + " ▁ " ) ; } else System . out . println ( 0 ) ; }
(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)))) (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: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (array_creation_expression type: (integral_type) dimensions: (dimensions_expr (identifier))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (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: (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: (array_access array: (identifier) index: (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (array_access array: (identifier) index: (decimal_integer_literal)))) (local_variable_declaration type: (generic_type (type_identifier) (type_arguments (type_identifier))) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (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: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (break_statement)) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (array_access array: (identifier) index: (identifier))) right: (array_access array: (identifier) index: (decimal_integer_literal)))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (array_access array: (identifier) index: (identifier)))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal))))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (binary_expression left: (identifier) right: (decimal_integer_literal)))) consequence: (block (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))))) (enhanced_for_statement type: (type_identifier) name: (identifier) value: (identifier) body: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (string_literal))))))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (decimal_integer_literal)))))))