public static void main ( String [ ] args ) throws IOException {
  PrintWriter out = new PrintWriter ( System . out ) ;
  FastScanner fs = new FastScanner ( ) ;
  long N ;
  N = fs . nextInt ( ) ;
  if ( N > 0 ) {
    out . println ( N ) ;
  }
  else {
    out . println ( Math . max ( ( int ) ( N / 10 ) , ( int ) ( ( N / 100 ) * 10 ) + ( N % 10 ) ) ) ;
  }
  out . close ( ) ;
}

public static void main ( String [ ] args ) throws IOException { PrintWriter out = new PrintWriter ( System . out ) ; FastScanner fs = new FastScanner ( ) ; long N ; N = fs . nextInt ( ) ; if ( N > 0 ) { out . println ( N ) ; } else { out . println ( Math . max ( ( int ) ( N / 10 ) , ( int ) ( ( N / 100 ) * 10 ) + ( N % 10 ) ) ) ; } out . close ( ) ; }
(method_declaration (modifiers) type: (void_type) name: (identifier) parameters: (formal_parameters (formal_parameter type: (array_type element: (type_identifier) dimensions: (dimensions)) name: (identifier))) (throws (type_identifier)) body: (block (local_variable_declaration type: (type_identifier) declarator: (variable_declarator name: (identifier) value: (object_creation_expression type: (type_identifier) arguments: (argument_list (field_access object: (identifier) field: (identifier)))))) (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))) (expression_statement (assignment_expression left: (identifier) right: (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))) (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 (identifier))))) alternative: (block (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (method_invocation object: (identifier) name: (identifier) arguments: (argument_list (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal)))) (binary_expression left: (cast_expression type: (integral_type) value: (parenthesized_expression (binary_expression left: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))) right: (decimal_integer_literal)))) right: (parenthesized_expression (binary_expression left: (identifier) right: (decimal_integer_literal))))))))))) (expression_statement (method_invocation object: (identifier) name: (identifier) arguments: (argument_list)))))