diff --git a/Book_1.ipynb b/Book_1.ipynb
index e4e7bc0..bad31ee 100644
--- a/Book_1.ipynb
+++ b/Book_1.ipynb
@@ -776,6 +776,27 @@
     "print(x0, x1)\n",
     "round(x1) - round(x0)-1"
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 34,
+   "id": "11bcd698-4d34-4a9f-8ae8-be65fe7f8707",
+   "metadata": {},
+   "outputs": [
+    {
+     "data": {
+      "text/plain": [
+       "27340847"
+      ]
+     },
+     "execution_count": 34,
+     "metadata": {},
+     "output_type": "execute_result"
+    }
+   ],
+   "source": [
+    "[round(number[0] - number[1]) for number in [[(-1 * numbers[1] + np.sqrt(numbers[0]))/2, ((-1 * numbers[1]) - np.sqrt(numbers[0]))/2] for numbers in [[((numbers[0]**2) - (4 * numbers[1]))]+numbers for numbers in [[int(''.join(re.findall('(\\d+)', line))) for line in open('data/puzzle_6.txt')]]]]][0]"
+   ]
   }
  ],
  "metadata": {
diff --git a/pretty_read.md b/pretty_read.md
index f212a6a..6267797 100644
--- a/pretty_read.md
+++ b/pretty_read.md
@@ -491,6 +491,18 @@ round(x1) - round(x0)-1
 
 
 
+    27340847
+
+
+
+
+```python
+[round(number[0] - number[1]) for number in [[(-1 * numbers[1] + np.sqrt(numbers[0]))/2, ((-1 * numbers[1]) - np.sqrt(numbers[0]))/2] for numbers in [[((numbers[0]**2) - (4 * numbers[1]))]+numbers for numbers in [[int(''.join(re.findall('(\d+)', line))) for line in open('data/puzzle_6.txt')]]]]][0]
+```
+
+
+
+
     27340847