static int countNum ( int n ) {
  if ( n > 10 ) return 0 ;
  return ( 9 * factorial ( 9 ) / factorial ( 10 - n ) ) ;
}

static int countNum ( int n ) { if ( n > 10 ) return 0 ; return ( 9 * factorial ( 9 ) / factorial ( 10 - n ) ) ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (return_statement (decimal_integer_literal))) (return_statement (parenthesized_expression (binary_expression left: (binary_expression left: (decimal_integer_literal) right: (method_invocation name: (identifier) arguments: (argument_list (decimal_integer_literal)))) right: (method_invocation name: (identifier) arguments: (argument_list (binary_expression left: (decimal_integer_literal) right: (identifier)))))))))