public static void main ( String [ ] args ) {
  int k = scn . nextInt ( ) ;
  StringBuilder ans = new StringBuilder ( ) ;
  int lenCheck = 18 ;
  while ( k > 1 && ans . length ( ) < 20 ) {
    ans . append ( 8 ) ;
    k -= 2 ;
  }
  if ( k == 1 ) {
    ans . append ( 4 ) ;
  }
  if ( ans . length ( ) > 18 ) System . out . println ( "-1" ) ;
  else System . out . println ( ans ) ;
}

public static void main ( String [ ] args ) { int k = scn . nextInt ( ) ; StringBuilder ans = new StringBuilder ( ) ; int lenCheck = 18 ; while ( k > 1 && ans . length ( ) < 20 ) { ans . append ( 8 ) ; k -= 2 ; } if ( k == 1 ) { ans . append ( 4 ) ; } if ( ans . length ( ) > 18 ) System . out . println ( " - 1" ) ; else System . out . println ( ans ) ; }
(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: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list)))) (local_variable_declaration type: (integral_type) declarator: (variable_declarator name: (identifier) value: (decimal_integer_literal))) (while_statement condition: (parenthesized_expression (binary_expression left: (binary_expression left: (identifier) right: (decimal_integer_literal)) right: (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal)))) body: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))) (expression_statement (assignment_expression left: (identifier) right: (decimal_integer_literal))))) (if_statement condition: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) consequence: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (decimal_integer_literal)))))) (if_statement condition: (parenthesized_expression (binary_expression left: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)) right: (decimal_integer_literal))) consequence: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (string_literal)))) alternative: (expression_statement (method_invocation object: (field_access object: (identifier) field: (identifier)) name: (identifier) arguments: (argument_list (identifier)))))))