static int phi ( int n ) {
  int result = n ;
  for ( int p = 2 ;
  p * p <= n ;
  ++ p ) {
    if ( n % p == 0 ) {
      while ( n % p == 0 ) n /= p ;
      result -= result / p ;
    }
  }
  if ( n > 1 ) result -= result / n ;
  return result ;
}

static int phi ( int n ) { int result = n ; for ( int p = 2 ; p * p <= n ; ++ p ) { if ( n % p == 0 ) { while ( n % p == 0 ) n /= p ; result -= result / p ; } } if ( n > 1 ) result -= result / n ; return result ; }
(method_declaration (modifiers) type: (integral_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (integral_type) name: (identifier))) body: (block (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (identifier))) (for_statement init: (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) condition: (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (identifier)) update: (update_expression (identifier)) body: (block (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) consequence: (block (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (identifier)) right: (decimal_integer_literal))) body: (expression_statement (assignment_expression left: (identifier) right: (identifier)))) (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier)))))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (expression_statement (assignment_expression left: (identifier) right: (binary_expression left: (identifier) right: (identifier))))) (return_statement (identifier))))