diff --git a/d13/run.py b/d13/run.py
new file mode 100644
index 0000000..50026b6
--- /dev/null
+++ b/d13/run.py
@@ -0,0 +1,26 @@
+import sys, os
+from collections import defaultdict as dd
+from itertools import permutations as PERM
+
+N:set[str] = set()
+D:dict[tuple[str,str],int] = dd(int)
+
+for l in sys.stdin.readlines():
+    [a,s,b] = l[:-1].split(" ")
+    D[(a,b)] += int(s)
+    D[(b,a)] += int(s)
+    N.add(a)
+    N.add(b)
+
+if len(sys.argv)>1 and sys.argv[1]=="2":
+    # add you
+    for a in N:
+        D[(a,'Y')] = 0
+        D[('Y',a)] = 0
+    N.add('Y')
+
+def score(chain:list[str]) -> int:
+    return sum(D[(a,b)] for (a,b) in zip(chain, chain[1:])) \
+       + D[(chain[0],chain[-1])]
+
+print(max(score(p) for p in PERM(N)))