;;; https://gitlab.com/Syndamia/senzill
(require :senzill)
(use-package :senzill.math)
(use-package :senzill.collections)
(use-package :senzill.io)

(ask-for-stream (prog-input)
  (let ((X 1) (cycles 1) (check-on 20) (check-max 220) (signal-sum 0))

    (doread-lines (inpt :read-line-options (prog-input NIL))
                  (loop for i from 1 to (if (char= (char inpt 0) #\a) 2 1)
                        if (and (> check-on 0) (= cycles check-on))
                          do (+= signal-sum (* X check-on))
                             (if (< check-on check-max)
                               (+= check-on 40)
                               (setf check-on -1))
                        if (= i 2)
                          do (+= X (parse-integer inpt :start 5))
                        do (++1 cycles)))
    (print signal-sum)))