diff --git a/day13/input b/day13/input
new file mode 100644
index 0000000..3509604
--- /dev/null
+++ b/day13/input
@@ -0,0 +1,449 @@
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+
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+
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+
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+
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+
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diff --git a/day13/sample b/day13/sample
new file mode 100644
index 0000000..af73fbb
--- /dev/null
+++ b/day13/sample
@@ -0,0 +1,23 @@
+[1,1,3,1,1]
+[1,1,5,1,1]
+
+[[1],[2,3,4]]
+[[1],4]
+
+[9]
+[[8,7,6]]
+
+[[4,4],4,4]
+[[4,4],4,4,4]
+
+[7,7,7,7]
+[7,7,7]
+
+[]
+[3]
+
+[[[]]]
+[[]]
+
+[1,[2,[3,[4,[5,6,7]]]],8,9]
+[1,[2,[3,[4,[5,6,0]]]],8,9]
diff --git a/day13/sol.py b/day13/sol.py
new file mode 100644
index 0000000..238548a
--- /dev/null
+++ b/day13/sol.py
@@ -0,0 +1,47 @@
+
+data = []
+for chunk in open("input").read().split("\n\n"):
+    data.append([eval(x) for x in chunk.splitlines(False)])
+
+def less(a, b):
+    if type(a) == int and type(b) == int:
+        return a < b
+    if type(a) == list and type(b) == int:
+        b = [b]
+    elif type(a) == int and type(b) == list:
+        a = [a]
+        
+    for x, y in zip(a,b):
+        if less(x,y):
+            return True
+        elif less(y,x):
+            return False
+    return len(a)<len(b)
+
+#print(data)
+
+t = 0
+for i,(a,b) in enumerate(data):
+    #print("<" if less(a,b) else ">=")
+    if less(a,b):
+        t += i + 1
+print(t)
+
+
+import functools
+def cmp(a, b):
+    if less(a,b):
+        return -1
+    if less(b,a):
+        return 1
+    return 0
+
+big = [e for x in data for e in x]
+big.append([[2]])
+big.append([[6]])
+big.sort(key=functools.cmp_to_key(cmp))
+
+i1 = big.index([[2]]) + 1
+i2 = big.index([[6]]) + 1
+
+print(i1*i2)