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+;;; leap.el --- Leap exercise (exercism)
+
+;;; Commentary:
+
+;;; Code:
+(defun divisible-by-p (n d)
+  (equal 0 (% n d)))
+
+(defun leap-year-p (year)
+  (and (divisible-by-p year 4)
+       (or (not (divisible-by-p year 100))
+           (divisible-by-p year 400))))
+
+(provide 'leap-year-p)
+;;; leap.el ends here