diff --git a/day05.js b/day05.js
new file mode 100644
index 0000000..bb6c85f
--- /dev/null
+++ b/day05.js
@@ -0,0 +1,2 @@
+let d=document.body.textContent.replaceAll(/[FL]/g,0).replaceAll(/[BR]/g,1).trim().split`
+`.map(c=>parseInt(c.slice(0,7),2)*8+parseInt(c.slice(7),2)).sort((a,b)=>b-a);[d[0],d.find((s,i,S)=>s-S[i+1]==2)-1]
\ No newline at end of file