diff --git a/day13/input.txt b/day13/input.txt
new file mode 100644
index 0000000..6e854e5
--- /dev/null
+++ b/day13/input.txt
@@ -0,0 +1,866 @@
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+
+fold along x=655
+fold along y=447
+fold along x=327
+fold along y=223
+fold along x=163
+fold along y=111
+fold along x=81
+fold along y=55
+fold along x=40
+fold along y=27
+fold along y=13
+fold along y=6
diff --git a/day13/part1.py b/day13/part1.py
new file mode 100644
index 0000000..b42118b
--- /dev/null
+++ b/day13/part1.py
@@ -0,0 +1,19 @@
+#!/usr/bin/env python3
+
+lines = (x.strip() for x in open("input.txt"))
+points = set()
+# 1311,895
+
+for line in lines:
+    if line.startswith("fold along x="):
+        mark = int(line[13:])
+        points = set((x if mark > x else 2*mark-x, y) for x, y in points if mark != x)
+        break
+    elif line.startswith("fold along y="):
+        mark = int(line[13:])
+        points = set((x, y if mark > y else 2*mark-y) for x, y in points if mark != y)
+        break
+    elif len(line) > 0:
+        points.add(tuple(int(num) for num in line.split(",")))
+
+print(len(points))
diff --git a/day13/part2.py b/day13/part2.py
new file mode 100644
index 0000000..0143855
--- /dev/null
+++ b/day13/part2.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+from functools import reduce
+import numpy as np
+
+lines = (x.strip() for x in open("input.txt"))
+points = set()
+# 1311,895
+
+for line in lines:
+    if line.startswith("fold along x="):
+        mark = int(line[13:])
+        points = set((x if mark > x else 2*mark-x, y) for x, y in points if mark != x)
+    elif line.startswith("fold along y="):
+        mark = int(line[13:])
+        points = set((x, y if mark > y else 2*mark-y) for x, y in points if mark != y)
+    elif len(line) > 0:
+        points.add(tuple(int(num) for num in line.split(",")))
+
+max_x, max_y = reduce(lambda p, c: tuple(map(max, zip(p, c))), points)
+for line in (''.join('#' if (x, y) in points else ' ' for x in range(max_x+1)) for y in range(max_y+1)):
+    print(line)