public static void main ( String [ ] $ ) {
  int n = scanner . nextInt ( ) ;
  int [ ] salary = new int [ n ] ;
  List < Integer > [ ] list = IntStream . range ( 0 , n ) . mapToObj ( i -> new ArrayList < > ( ) ) . toArray ( List [ ] :: new ) ;
  for ( int i = 1 ;
  i < n ;
  i ++ ) list [ scanner . nextInt ( ) - 1 ] . add ( i ) ;
  boolean flag = true ;
  while ( flag ) {
    flag = false ;
    for ( int i = 0 ;
    i < n ;
    i ++ ) {
      int [ ] array = list [ i ] . stream ( ) . mapToInt ( j -> salary [ j ] ) . toArray ( ) ;
      if ( salary [ i ] == 0 && Arrays . stream ( array ) . noneMatch ( j -> j == 0 ) ) {
        flag = true ;
        salary [ i ] = Arrays . stream ( array ) . min ( ) . orElse ( 0 ) + Arrays . stream ( array ) . max ( ) . orElse ( 0 ) + 1 ;
      }
    }
  }
  System . out . println ( salary [ 0 ] ) ;
}

public static void main ( String [ ] $ ) { int n = scanner . nextInt ( ) ; int [ ] salary = new int [ n ] ; List < Integer > [ ] list = IntStream . range ( 0 , n ) . mapToObj ( i -> new ArrayList < > ( ) ) . toArray ( List [ ] :: new ) ; for ( int i = 1 ; i < n ; i ++ ) list [ scanner . nextInt ( ) - 1 ] . add ( i ) ; boolean flag = true ; while ( flag ) { flag = false ; for ( int i = 0 ; i < n ; i ++ ) { int [ ] array = list [ i ] . stream ( ) . mapToInt ( j -> salary [ j ] ) . toArray ( ) ; if ( salary [ i ] == 0 && Arrays . stream ( array ) . noneMatch ( j -> j == 0 ) ) { flag = true ; salary [ i ] = Arrays . stream ( array ) . min ( ) . orElse ( 0 ) + Arrays . stream ( array ) . max ( ) . orElse ( 0 ) + 1 ; } } } System . out . println ( salary [ 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: (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: (array_type element: (generic_type (type_identifier) (type_arguments (type_identifier))) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal) (identifier))) name: (identifier) arguments: (argument_list (lambda_expression parameters: (identifier) body: (object_creation_expression type: (generic_type (type_identifier) (type_arguments)) arguments: (argument_list))))) name: (identifier) arguments: (argument_list (method_reference (array_type element: (type_identifier) dimensions: (dimensions))))))) (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: (expression_statement (method_invocation object: (array_access array: (identifier) index: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) name: (identifier) arguments: (argument_list (identifier))))) (local_variable_declaration type: (boolean_type) declarator: (variable_declarator name: (identifier) value: (true))) (while_statement condition: (parenthesized_expression (identifier)) body: (block (expression_statement (assignment_expression left: (identifier) right: (false))) (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 (local_variable_declaration type: (array_type element: (integral_type) dimensions: (dimensions)) declarator: (variable_declarator name: (identifier) value: (method_invocation object: (method_invocation object: (method_invocation object: (array_access array: (identifier) index: (identifier)) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list (lambda_expression parameters: (identifier) body: (array_access array: (identifier) index: (identifier))))) name: (identifier) arguments: (argument_list)))) (if_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (array_access array: (identifier) index: (identifier)) right: (decimal_integer_literal)) right: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) name: (identifier) arguments: (argument_list (lambda_expression parameters: (identifier) body: (binary_expression left: (identifier) right: (decimal_integer_literal))))))) consequence: (block (expression_statement (assignment_expression left: (identifier) right: (true))) (expression_statement (assignment_expression left: (array_access array: (identifier) index: (identifier)) right: (binary_expression left: (binary_expression left: (method_invocation object: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list (decimal_integer_literal))) right: (method_invocation object: (method_invocation object: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (identifier))) name: (identifier) arguments: (argument_list)) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) right: (decimal_integer_literal)))))))))) (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (array_access array: (identifier) index: (decimal_integer_literal)))))))