diff --git a/day-16/01.py b/day-16/01.py
new file mode 100644
index 0000000..29c136f
--- /dev/null
+++ b/day-16/01.py
@@ -0,0 +1,37 @@
+from ops import ops
+from copy import copy
+
+with open('input.txt', 'r') as f:
+    raw = f.readlines()
+
+    samples = []
+    i = 0
+    while 1:
+        sample = {}
+        if raw[i] == '\n':
+            break
+
+        sample['in'] = [int(x) for x in raw[i][9:-2].split(', ')]
+        sample['op'] = [int(x) for x in raw[i + 1].strip().split(' ')]
+        sample['out'] = [int(x) for x in raw[i + 2][9:-2].split(', ')]
+        samples.append(sample)
+        i += 4
+
+print(samples)
+
+res = 0
+
+for sample in samples:
+    count = 0
+    num, a, b, c = sample['op']
+    for op in ops:
+        try:
+            if sample['out'] == op(copy(sample['in']), a, b, c):
+                count += 1
+        except:
+            pass
+    if count >= 3:
+        res += 1
+        # print(sample)
+    
+print(res)
\ No newline at end of file
diff --git a/day-16/02.py b/day-16/02.py
new file mode 100644
index 0000000..30871bd
--- /dev/null
+++ b/day-16/02.py
@@ -0,0 +1,72 @@
+from ops import ops
+from copy import copy
+from pprint import pprint
+
+with open('input.txt', 'r') as f:
+    raw = f.readlines()
+
+    samples = []
+    i = 0
+    while 1:
+        sample = {}
+        if raw[i] == '\n':
+            break
+
+        sample['in'] = [int(x) for x in raw[i][9:-2].split(', ')]
+        sample['op'] = [int(x) for x in raw[i + 1].strip().split(' ')]
+        sample['out'] = [int(x) for x in raw[i + 2][9:-2].split(', ')]
+        samples.append(sample)
+        i += 4
+
+# print(samples)
+
+observations = dict()
+
+for sample in samples:
+    count = 0
+    num, a, b, c = sample['op']
+    valid = set()
+    for op in ops:
+        try:
+            if sample['out'] == op(copy(sample['in']), a, b, c):
+                count += 1
+                valid.add(op)
+        except:
+            pass
+
+    if observations.get(num) is None:
+        observations[num] = valid
+    else:
+        observations[num] = observations[num].intersection(valid)
+    
+# pprint(observations)
+ops_map = dict()
+
+while len(observations) != 0:
+    to_del = list()
+    for num, funcs in observations.items():
+        funcs = funcs - set(ops_map.values())
+        if len(funcs) == 1:
+            ops_map[num] = next(iter(funcs))
+            to_del.append(num)
+    for num in to_del:
+        del observations[num]
+
+pprint(ops_map)
+
+with open('input.txt', 'r') as f:
+    raw = f.readlines()
+    instructions = []
+    for line in raw[i + 2:]:
+        instructions.append([int(x) for x in line.strip().split(' ')])
+
+pprint(instructions)
+
+reg = [0, 0, 0, 0]
+
+for ins in instructions:
+    num, a, b, c = ins
+    reg = ops_map[num](reg, a, b, c)
+
+print(reg)
+print(reg[0])
\ No newline at end of file
diff --git a/day-16/example.txt b/day-16/example.txt
new file mode 100644
index 0000000..b90bc4b
--- /dev/null
+++ b/day-16/example.txt
@@ -0,0 +1,5 @@
+Before: [3, 2, 1, 1]
+9 2 1 2
+After:  [3, 2, 2, 1]
+
+
diff --git a/day-16/input.txt b/day-16/input.txt
new file mode 100644
index 0000000..c47e0eb
--- /dev/null
+++ b/day-16/input.txt
@@ -0,0 +1,4024 @@
+Before: [3, 0, 1, 3]
+15 2 1 3
+After:  [3, 0, 1, 1]
+
+Before: [1, 3, 2, 0]
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+
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+After:  [3, 3, 3, 1]
+
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+After:  [2, 1, 1, 3]
+
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\ No newline at end of file
diff --git a/day-16/ops.py b/day-16/ops.py
new file mode 100644
index 0000000..ff68d8e
--- /dev/null
+++ b/day-16/ops.py
@@ -0,0 +1,73 @@
+def addr(reg, a, b, c):
+    reg[c] = reg[a] + reg[b]
+    return reg
+
+def addi(reg, a, b, c):
+    reg[c] = reg[a] + b
+    return reg
+
+def mulr(reg, a, b, c):
+    reg[c] = reg[a] * reg[b]
+    return reg
+
+def muli(reg, a, b, c):
+    reg[c] = reg[a] * b
+    return reg
+
+def banr(reg, a, b, c):
+    reg[c] = reg[a] & reg[b]
+    return reg
+
+def bani(reg, a, b, c):
+    reg[c] = reg[a] & b
+    return reg
+
+def borr(reg, a, b, c):
+    reg[c] = reg[a] | reg[b]
+    return reg
+
+def bori(reg, a, b, c):
+    reg[c] = reg[a] | b
+    return reg
+
+def setr(reg, a, b, c):
+    reg[c] = reg[a]
+    return reg
+
+def seti(reg, a, b, c):
+    reg[c] = a
+    return reg
+
+def gtir(reg, a, b, c):
+    reg[c] = 1 if a > reg[b] else 0
+    return reg
+
+def gtri(reg, a, b, c):
+    reg[c] = 1 if reg[a] > b else 0
+    return reg
+
+def gtrr(reg, a, b, c):
+    reg[c] = 1 if reg[a] > reg[b] else 0
+    return reg
+
+def eqir(reg, a, b, c):
+    reg[c] = 1 if a == reg[b] else 0
+    return reg
+
+def eqri(reg, a, b, c):
+    reg[c] = 1 if reg[a] == b else 0
+    return reg
+
+def eqrr(reg, a, b, c):
+    reg[c] = 1 if reg[a] == reg[b] else 0
+    return reg
+
+ops = [
+    addr, addi,
+    mulr, muli,
+    banr, bani,
+    borr, bori,
+    setr, seti,
+    gtir, gtri, gtrr,
+    eqir, eqri, eqrr
+]