Scripts not permitted to use staticMethod java.lang.Math max int int

  last_run = selectRun filter: parameters("Target_OS=CentOS${os}"), job: env.JOB_NAME, selector: status('STABLE'), verbose: true
  id_to_copy = Math.max(id_to_copy,last_run.getId() as int)

Expected outcome: ability to use, or at least approve under /scriptApproval/, Math.max(). If there's a better way to do it, I am a groovy noob and just copying examples in most places.