diff --git a/2015/days/05/nice.lisp b/2015/days/05/nice.lisp
new file mode 100644
index 0000000..029b3c6
--- /dev/null
+++ b/2015/days/05/nice.lisp
@@ -0,0 +1,51 @@
+(defvar c)
+(defvar counter)
+(defun threevowels? (string)
+  (setq counter 0)
+  (loop for i from 0 to (- (length string) 1)
+        do (setq c (char string i))
+           (setq counter (+ counter (if (or
+                                         (equal c #\a)
+                                         (equal c #\e)
+                                         (equal c #\i)
+                                         (equal c #\o)
+                                         (equal c #\u))
+                                        1
+                                        0)))
+        (if (>= counter 3)
+            (return-from threevowels? t)))
+nil)
+
+(defvar c1)
+(defvar c2)
+(defun twice? (string)
+  (loop for i from 0 to (- (length string) 2)
+        do (setq c1 (char string i))
+           (setq c2 (char string (+ i 1)))
+           (if (equal c1 c2)
+               (return-from twice? t))
+        )
+  nil)
+
+(defun redflag? (string)
+  (or (search "ab" string)
+      (search "cd" string)
+      (search "pq" string)
+      (search "xy" string)))
+
+(defun nice? (string)
+  (and (threevowels? string)
+       (twice? string)
+       (not (redflag? string))))
+
+(defvar my-count 0)
+
+(with-open-file (in "./data/input")
+  (do ((line (read-line in nil)
+             (read-line in nil)))
+      ((null line))
+    (if (nice? line)
+        (setq my-count (+ my-count 1)))
+    ))
+
+(print my-count)