on *:text:*calc*:#:{
  if ($1 == !) {
    if ($2 != $null) {
      notice $nick $+, $calc($2-)
    }
    else {
      notice $nick You dont have anything to make me calculate.
    }
  }
  elseif ($1 == @) {
    if ($2 != $null) {
      msg $chan $nick $+, $calc($2-) $+ .
    }
    else {
      notice $nick You dont have anything to make me calculate.
    }
  }
}