diff --git a/day05.py b/day05.py
new file mode 100644
index 0000000..25efb27
--- /dev/null
+++ b/day05.py
@@ -0,0 +1,52 @@
+#!/usr/bin/env python3
+
+from functools import cmp_to_key
+
+
+o = {}
+p = {}
+i = []
+
+with open("day05") as f:
+    l = f.readline()
+    while l != '\n':
+        a,b = map(int, l.strip().split('|'))
+
+        if a in o: o[a].add(b)
+        else: o[a] = {b}
+
+        if b in p: p[b].add(a)
+        else: p[b] = {a}
+
+        l = f.readline()
+
+    for l in f:
+        i.append(list(map(int, l.strip().split(','))))
+
+# 1
+res = 0
+un = []
+for l in i:
+    for j in range(len(l)):
+        if l[j] in o:
+            if not set(l[j+1:]) <= o[l[j]]:
+                un.append(l)
+                break
+        if l[j] in p:
+            if not set(l[:j]) <= p[l[j]]:
+                un.append(l)
+                break
+    else:
+        res += l[len(l)//2]
+
+# 2
+def cmp(a,b):
+    if a in o and b in o[a]: return -1
+    if b in o and a in o[a]: return 1
+    else: return 0
+
+
+res = 0
+for l in un:
+    ls = sorted(l, key=cmp_to_key(cmp))
+    res += ls[len(ls)//2]