static int countX ( int n ) {
  String binary = Integer . toBinaryString ( n ) ;
  int count = 0 ;
  for ( int i = 0 ;
  i < binary . length ( ) ;
  i ++ ) {
    if ( binary . charAt ( i ) == '1' ) count ++ ;
  }
  int answer = ( int ) Math . pow ( 2 , count ) ;
  return answer ;
}

static int countX ( int n ) { String binary = Integer . toBinaryString ( n ) ; int count = 0 ; for ( int i = 0 ; i < binary . length ( ) ; i ++ ) { if ( binary . charAt ( i ) == '1' ) count ++ ; } int answer = ( int ) Math . pow ( 2 , count ) ; return answer ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (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: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list))) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) right: (character_literal))) consequence: (expression_statement (update_expression (identifier)))))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (cast_expression type: (integral_type) value: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier)))))) (return_statement (identifier))))