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diff --git a/year2021/day1/part1.clj b/year2021/day1/part1.clj
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+; Day 1, part 1
+; Read a list of numbers from stdin, separated by newlines.
+; Count occurances of the current number being greater than
+; the previous.
+;
+
+(as-> (slurp "./in") $
+     (clojure.string/split-lines $)
+     (map read-string $)
+     (reduce
+       #(cond-> (assoc %1 0 %2) (> %2 (first %1)) (update 1 inc))
+       [(first $) 0]
+       (rest $))
+     (println (second $)))
+