diff --git a/online_judges/utopian_tree/utopian_tree_challenge.ipynb b/online_judges/utopian_tree/utopian_tree_challenge.ipynb
index f5b1340..8de1a43 100644
--- a/online_judges/utopian_tree/utopian_tree_challenge.ipynb
+++ b/online_judges/utopian_tree/utopian_tree_challenge.ipynb
@@ -68,7 +68,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": null,
    "metadata": {
     "collapsed": false
    },
@@ -78,15 +78,8 @@
     "# cycles = 1, print 2: i = 1: 1 * 2\n",
     "# cycles = 4, print 7: i = 1: 1 * 2, i = 2: 2 + 1, i = 3: 3 * 2, i = 4: 6 + 1\n",
     "def calc_utopian_tree_height(cycles):\n",
-    "    height = 1\n",
-    "    if cycles == 0:\n",
-    "        return height\n",
-    "    for i in xrange(1, cycles+1):\n",
-    "        if i % 2 == 1:\n",
-    "            height *= 2\n",
-    "        else:\n",
-    "            height += 1\n",
-    "    return height"
+    "    # TODO: Implement me\n",
+    "    pass"
    ]
   },
   {
diff --git a/online_judges/utopian_tree/utopian_tree_solution.ipynb b/online_judges/utopian_tree/utopian_tree_solution.ipynb
index 6265e4b..582b050 100644
--- a/online_judges/utopian_tree/utopian_tree_solution.ipynb
+++ b/online_judges/utopian_tree/utopian_tree_solution.ipynb
@@ -62,7 +62,7 @@
     "* Return height\n",
     "\n",
     "Complexity:\n",
-    "* Time: O(n), where n is the number of cycles, for each cycle we perform a calculation\n",
+    "* Time: O(n)\n",
     "* Space: O(1)"
    ]
   },