diff --git a/day18-scratch.lisp b/day18-scratch.lisp
index 0096129..7b50d62 100644
--- a/day18-scratch.lisp
+++ b/day18-scratch.lisp
@@ -155,8 +155,12 @@
 
 (fill-outside-with-2 '(0 0 0) *day-18-input-connectivity*)
 (count-open-sides-to-outside *day-18-input-connectivity*)
+;; 2484  -  not correct, too low
 ;; there's 1 at the edge of the array. whoops. so there are 0s in the input?
 ;; yep. so now what, shift all by 1? and add one more +1 to the find max?
 ;; hahaha, this is stupid.
 
 ;; but let's do it
+(coords-from-input "day18-test.txt")    ; yep. +1
+
+;; 2490
diff --git a/day18.lisp b/day18.lisp
index 60ee43b..93f1bab 100644
--- a/day18.lisp
+++ b/day18.lisp
@@ -11,9 +11,9 @@
 (defun find-maxes (all-coords)
  (loop
   for (x y z) in all-coords
-  maximize (+ x 2) into xs
-  maximize (+ y 2) into ys
-  maximize (+ z 2) into zs
+  maximize (+ x 3) into xs
+  maximize (+ y 3) into ys
+  maximize (+ z 3) into zs
   finally (return (list xs ys zs))) )
 
 (defun fill-connectivity-array (all-coords connectivity-matrix)