static int countNumbers ( int x , int n ) {
  if ( x > n ) return 0 ;
  return 1 + countNumbers ( x * 10 , n ) + countNumbers ( x * 10 + 1 , n ) ;
}

static int countNumbers ( int x , int n ) { if ( x > n ) return 0 ; return 1 + countNumbers ( x * 10 , n ) + countNumbers ( x * 10 + 1 , n ) ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier)) (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (identifier))) consequence: (return_statement (decimal_integer_literal))) (return_statement (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (identifier) right: (decimal_integer_literal)) (identifier)))) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (decimal_integer_literal)) (identifier)))))))