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(require '[clojure.string :as str])
(->> (read-line)
(#(str/split % #","))
(map #(Integer/parseInt %))
(reduce #(update %1 %2 inc) (vec (repeat 9 0)))
(iterate
#(let [nf (conj (vec (rest %)) (first %))]
(update nf 6 (partial + (get nf 8)))
)
)
(#(nth % 256))
(apply +)
(println)
)
; ->> read input from stdin
; split input string by commas
; convert string array into number array
; reduce to frequency counts
; create iterator that returns next day's counts
; get 256th iteration
; sum all frequency counts
; print results
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