diff --git a/common_lisp/2015/1/problem.lisp b/common_lisp/2015/1/problem.lisp
new file mode 100644
index 0000000..8e3b95a
--- /dev/null
+++ b/common_lisp/2015/1/problem.lisp
@@ -0,0 +1,23 @@
+(require :uiop)
+
+(defun input-string () (uiop:read-file-string "../../../data/2015/1/input.txt"))
+
+(defun floor-from-next-char (floor char)
+  (if (char= #\( char) (1+ floor) (if (char= #\) char) (1- floor) floor)))
+
+(defun floor-from-string (string)
+  (reduce #'floor-from-next-char string :initial-value 0))
+
+(defun steps-from-string (string)
+(cdr (reduce (lambda (a b)
+		   (let ((floor (car a))
+			 (steps (cdr a)))
+		     (if (> 0 floor) (cons floor steps)
+			 (cons (floor-from-next-char floor b) (1+ steps)))))
+		 string :initial-value (cons 0 0))))
+
+(defun part-1 () (format t "Part 1: ~a" (floor-from-string (input-string))))
+(defun part-2 () (format t "Part 2: ~a" (steps-from-string (input-string))))
+(defun solution () (part-1) (terpri) (part-2) (terpri))
+
+(solution)