diff --git a/2016/day12-input b/2016/day12-input
new file mode 100644
index 0000000..0eeb395
--- /dev/null
+++ b/2016/day12-input
@@ -0,0 +1,23 @@
+cpy 1 a
+cpy 1 b
+cpy 26 d
+jnz c 2
+jnz 1 5
+cpy 7 c
+inc d
+dec c
+jnz c -2
+cpy a c
+inc a
+dec b
+jnz b -2
+cpy c b
+dec d
+jnz d -6
+cpy 14 c
+cpy 14 d
+inc a
+dec d
+jnz d -2
+dec c
+jnz c -5
diff --git a/2016/day12.py b/2016/day12.py
new file mode 100644
index 0000000..5bbaebd
--- /dev/null
+++ b/2016/day12.py
@@ -0,0 +1,30 @@
+with open('day12-input', 'r') as file:
+  data = [l.strip('\n') for l in file]
+TOKENS = [line.split(' ') for line in data]
+
+def run(registers):
+  def get(key):
+    try:
+      return registers[key]
+    except KeyError:
+      return int(key)
+  i = 0
+  while i < len(data):
+    tokens = TOKENS[i]  # data[i].split(' ')
+    if tokens[0] == 'cpy':
+      registers[tokens[2]] = get(tokens[1])
+    elif tokens[0] == 'inc':
+      registers[tokens[1]] += 1
+    elif tokens[0] == 'dec':
+      registers[tokens[1]] -= 1
+    else:  # elif tokens[0] == 'jnz':
+      if get(tokens[1]) != 0:
+        i += int(tokens[2]) - 1
+    i += 1
+registers1 = {'a': 0, 'b': 0, 'c': 0, 'd': 0}
+run(registers1)
+print(registers1['a'])  # Part 1
+
+registers2 = {'a': 0, 'b': 0, 'c': 1, 'd': 0}
+run(registers2)
+print(registers2['a'])  # Part 2 - Slow!