diff --git a/16/a.py b/16/a.py
new file mode 100755
index 0000000..2d8fe70
--- /dev/null
+++ b/16/a.py
@@ -0,0 +1,191 @@
+#!/usr/bin/env python3
+
+
+"""
+four registers (numbered 0 through 3) that
+can be manipulated by instructions containing one of 16 opcodes.
+The registers start with the value 0.
+
+Every instruction consists of four values:
+    an opcode,
+    two inputs (named A and B), and
+    an output (named C), in that order.
+
+The opcode specifies the behavior of the instruction and how the inputs are interpreted.
+The output, C, is always treated as a register.
+
+ch opcode has a number from 0 through 15
+"""
+
+
+def addr(regs, a, b, c):
+    # addr (add register) stores into register C the result of adding register A and register B.
+    regs.set(c, regs.get(a) + regs.get(b))
+
+
+def addi(regs, a, b, c):
+    # addi (add immediate) stores into register C the result of adding register A and value B.
+    regs.set(c, regs.get(a) + b)
+
+
+def mulr(regs, a, b, c):
+    # mulr (multiply register) stores into register C the result of multiplying register A and register B.
+    regs.set(c, regs.get(a) * regs.get(b))
+
+
+def muli(regs, a, b, c):
+    # muli (multiply immediate) stores into register C the result of multiplying register A and value B.
+    regs.set(c, regs.get(a) * b)
+
+
+def banr(regs, a, b, c):
+    # banr (bitwise AND register) stores into register C the result of the bitwise AND of register A and register B.
+    regs.set(c, regs.get(a) & regs.get(b))
+
+
+def bani(regs, a, b, c):
+    # bani (bitwise AND immediate) stores into register C the result of the bitwise AND of register A and value B.
+    regs.set(c, regs.get(a) & b)
+
+
+def borr(regs, a, b, c):
+    # borr (bitwise OR register) stores into register C the result of the bitwise OR of register A and register B.
+    regs.set(c, regs.get(a) | regs.get(b))
+
+
+def bori(regs, a, b, c):
+    # bori (bitwise OR immediate) stores into register C the result of the bitwise OR of register A and value B.
+    regs.set(c, regs.get(a) | b)
+
+
+def setr(regs, a, b, c):
+    # setr (set register) copies the contents of register A into register C. (Input B is ignored.)
+    regs.set(c, regs.get(a))
+
+
+def seti(regs, a, b, c):
+    # seti (set immediate) stores value A into register C. (Input B is ignored.)
+    regs.set(c, a)
+
+
+def gtir(regs, a, b, c):
+    # gtir (greater-than immediate/register) sets register C to 1 if value A is greater than register B. Otherwise, register C is set to 0.
+    regs.set(c, 1 if a > regs.get(b) else 0)
+
+
+def gtri(regs, a, b, c):
+    # gtri (greater-than register/immediate) sets register C to 1 if register A is greater than value B. Otherwise, register C is set to 0.
+    regs.set(c, 1 if regs.get(a) > b else 0)
+
+
+def gtrr(regs, a, b, c):
+    # gtrr (greater-than register/register) sets register C to 1 if register A is greater than register B. Otherwise, register C is set to 0.
+    regs.set(c, 1 if regs.get(a) > regs.get(b) else 0)
+
+
+def eqir(regs, a, b, c):
+    # eqir (equal immediate/register) sets register C to 1 if value A is equal to register B. Otherwise, register C is set to 0.
+    regs.set(c, 1 if a == regs.get(b) else 0)
+
+
+def eqri(regs, a, b, c):
+    # eqri (equal register/immediate) sets register C to 1 if register A is equal to value B. Otherwise, register C is set to 0.
+    regs.set(c, 1 if regs.get(a) == b else 0)
+
+
+def eqrr(regs, a, b, c):
+    # eqrr (equal register/register) sets register C to 1 if register A is equal to register B. Otherwise, register C is set to 0.
+    regs.set(c, 1 if regs.get(a) == regs.get(b) else 0)
+
+
+ops = (addr,
+       addi,
+       mulr,
+       muli,
+       banr,
+       bani,
+       borr,
+       bori,
+       setr,
+       seti,
+       gtir,
+       gtri,
+       gtrr,
+       eqir,
+       eqri,
+       eqrr)
+
+
+class Registers(object):
+    def __init__(self, initial=None):
+        self.regs = list(initial) if initial else [0, 0, 0, 0]
+
+    def get(self, num):
+        return self.regs[num]
+
+    def set(self, num, value):
+        self.regs[num] = value
+
+
+class SampleInstr(object):
+    def __init__(self, before, instr, after):
+        self.before = before
+        self.instr = instr
+        self.after = after
+
+
+def load_samples(fname):
+    """
+    Load the samples into a list
+    """
+    samples = []
+    program = []
+    with open(fname) as f:
+        while True:
+            line = f.readline()
+            if not line.startswith("Before"):
+                break
+            samples.append(SampleInstr(
+                [int(i) for i in line.strip().split(": [")[1][0:-1].split(", ")],
+                [int(i) for i in f.readline().strip().split()],
+                [int(i) for i in f.readline().strip().split(":  [")[1][0:-1].split(", ")]))
+            f.readline()
+
+        f.readline()
+        for line in f.readlines():
+            program.append([int(i) for i in line.strip().split()])
+
+    return samples, program
+
+
+def run_sample(sample, op):
+    # Run the sample through one opcode and returns True if our output matches the sample output
+    r = Registers(sample.before)
+    op(r, *sample.instr[1:])
+    return sample.after == r.regs
+
+
+def sample_repeats(sample):
+    # run the sample through the opcodes until a duplicate result is found
+    matching = 0
+    for op in ops:
+        if run_sample(sample, op):
+            matching += 1
+        if matching >= 3:
+            return True
+    return False
+
+
+def main():
+    samples, _ = load_samples("input.txt")
+
+    repeating = 0
+    for sample in samples:
+        if sample_repeats(sample):
+            repeating += 1
+
+    print(repeating)
+
+
+if __name__ == '__main__':
+    main()
diff --git a/16/b.py b/16/b.py
new file mode 100755
index 0000000..fca8a09
--- /dev/null
+++ b/16/b.py
@@ -0,0 +1,51 @@
+#!/usr/bin/env python3
+
+
+from a import load_samples, ops, Registers
+
+
+def find_opcodes(samples):
+    # process of elimination to find opcode IDs
+
+    options = {i: set(ops) for i in range(0, 16)}
+    found_codes = set()
+    while len(found_codes) < 15:
+        for sample in samples:
+            op_id = sample.instr[0]
+            if op_id in found_codes:
+                continue
+            for op in list(options[op_id]):
+                cpu = Registers(sample.before)
+                op(cpu, *sample.instr[1:])
+                if cpu.regs != sample.after:
+                    options[op_id].remove(op)
+
+            if len(options[op_id]) == 1:
+                found_op = list(options[op_id])[0]
+                found_codes.update([op_id])
+                for o_opid, opset in options.items():
+                    if o_opid != op_id:
+                        try:
+                            opset.remove(found_op)
+                        except KeyError:
+                            pass
+
+    return {k: list(v)[0] for k, v in options.items()}
+
+
+def main():
+    samples, program = load_samples("input.txt")
+
+    optable = find_opcodes(samples)
+
+    cpu = Registers()
+
+    for instruction in program:
+        optable[instruction[0]](cpu, *instruction[1:])
+
+    print("Registers:", cpu.regs)
+    print("Answer:", cpu.regs[0])
+
+
+if __name__ == '__main__':
+    main()
diff --git a/16/input.txt b/16/input.txt
new file mode 100644
index 0000000..097d3af
--- /dev/null
+++ b/16/input.txt
@@ -0,0 +1,4266 @@
+Before: [0, 2, 0, 2]
+6 0 1 1
+After:  [0, 1, 0, 2]
+
+Before: [0, 3, 0, 1]
+3 3 1 3
+After:  [0, 3, 0, 1]
+
+Before: [2, 0, 3, 3]
+7 2 0 2
+After:  [2, 0, 2, 3]
+
+Before: [0, 2, 3, 3]
+13 0 3 0
+After:  [3, 2, 3, 3]
+
+Before: [2, 2, 3, 3]
+7 2 1 3
+After:  [2, 2, 3, 2]
+
+Before: [0, 2, 0, 0]
+4 0 1 0
+After:  [0, 2, 0, 0]
+
+Before: [2, 0, 3, 2]
+15 3 2 0
+After:  [4, 0, 3, 2]
+
+Before: [3, 3, 0, 3]
+12 3 3 0
+After:  [3, 3, 0, 3]
+
+Before: [2, 1, 1, 0]
+14 3 1 3
+After:  [2, 1, 1, 1]
+
+Before: [2, 2, 3, 2]
+7 2 3 1
+After:  [2, 2, 3, 2]
+
+Before: [0, 3, 2, 1]
+5 2 1 3
+After:  [0, 3, 2, 3]
+
+Before: [0, 2, 2, 3]
+10 1 2 0
+After:  [4, 2, 2, 3]
+
+Before: [2, 3, 2, 2]
+5 0 1 2
+After:  [2, 3, 3, 2]
+
+Before: [2, 0, 3, 0]
+7 2 0 1
+After:  [2, 2, 3, 0]
+
+Before: [3, 2, 3, 0]
+6 3 2 1
+After:  [3, 2, 3, 0]
+
+Before: [0, 3, 3, 0]
+4 0 1 0
+After:  [0, 3, 3, 0]
+
+Before: [0, 0, 2, 0]
+1 0 0 1
+After:  [0, 0, 2, 0]
+
+Before: [0, 2, 3, 3]
+1 0 0 0
+After:  [0, 2, 3, 3]
+
+Before: [1, 3, 1, 0]
+9 0 1 3
+After:  [1, 3, 1, 1]
+
+Before: [1, 3, 1, 3]
+9 0 1 1
+After:  [1, 1, 1, 3]
+
+Before: [2, 0, 3, 2]
+6 1 3 2
+After:  [2, 0, 3, 2]
+
+Before: [1, 1, 0, 0]
+14 3 1 0
+After:  [1, 1, 0, 0]
+
+Before: [2, 3, 0, 0]
+5 0 1 3
+After:  [2, 3, 0, 3]
+
+Before: [2, 3, 2, 3]
+10 0 2 2
+After:  [2, 3, 4, 3]
+
+Before: [0, 1, 3, 3]
+13 0 3 0
+After:  [3, 1, 3, 3]
+
+Before: [2, 0, 1, 2]
+15 0 2 2
+After:  [2, 0, 4, 2]
+
+Before: [2, 1, 0, 3]
+14 2 1 2
+After:  [2, 1, 1, 3]
+
+Before: [0, 3, 2, 2]
+4 0 2 0
+After:  [0, 3, 2, 2]
+
+Before: [1, 0, 3, 3]
+12 3 1 1
+After:  [1, 3, 3, 3]
+
+Before: [0, 2, 3, 2]
+7 2 3 3
+After:  [0, 2, 3, 2]
+
+Before: [1, 1, 2, 3]
+10 1 3 3
+After:  [1, 1, 2, 3]
+
+Before: [0, 2, 1, 3]
+1 0 0 1
+After:  [0, 0, 1, 3]
+
+Before: [3, 1, 2, 2]
+2 3 1 3
+After:  [3, 1, 2, 3]
+
+Before: [1, 0, 3, 3]
+10 0 2 0
+After:  [3, 0, 3, 3]
+
+Before: [1, 0, 2, 3]
+11 0 1 0
+After:  [1, 0, 2, 3]
+
+Before: [2, 1, 2, 2]
+13 1 3 2
+After:  [2, 1, 3, 2]
+
+Before: [0, 1, 2, 1]
+2 3 2 0
+After:  [3, 1, 2, 1]
+
+Before: [2, 0, 0, 3]
+15 0 2 3
+After:  [2, 0, 0, 4]
+
+Before: [1, 3, 3, 2]
+15 3 2 1
+After:  [1, 4, 3, 2]
+
+Before: [1, 2, 3, 0]
+10 0 2 1
+After:  [1, 3, 3, 0]
+
+Before: [2, 2, 2, 1]
+2 3 2 3
+After:  [2, 2, 2, 3]
+
+Before: [3, 3, 2, 1]
+10 2 2 2
+After:  [3, 3, 4, 1]
+
+Before: [3, 2, 2, 2]
+10 3 2 2
+After:  [3, 2, 4, 2]
+
+Before: [1, 1, 3, 1]
+2 3 2 0
+After:  [3, 1, 3, 1]
+
+Before: [2, 1, 1, 0]
+14 3 1 1
+After:  [2, 1, 1, 0]
+
+Before: [1, 0, 2, 1]
+11 3 1 0
+After:  [1, 0, 2, 1]
+
+Before: [1, 3, 0, 2]
+9 0 1 1
+After:  [1, 1, 0, 2]
+
+Before: [0, 1, 1, 0]
+4 0 2 0
+After:  [0, 1, 1, 0]
+
+Before: [3, 3, 2, 1]
+5 2 1 0
+After:  [3, 3, 2, 1]
+
+Before: [3, 1, 1, 0]
+14 3 1 3
+After:  [3, 1, 1, 1]
+
+Before: [1, 3, 2, 3]
+5 2 1 1
+After:  [1, 3, 2, 3]
+
+Before: [1, 2, 2, 1]
+2 3 2 2
+After:  [1, 2, 3, 1]
+
+Before: [3, 3, 3, 2]
+15 3 2 0
+After:  [4, 3, 3, 2]
+
+Before: [0, 3, 2, 1]
+5 2 1 2
+After:  [0, 3, 3, 1]
+
+Before: [1, 1, 0, 2]
+2 3 1 2
+After:  [1, 1, 3, 2]
+
+Before: [3, 1, 0, 3]
+8 3 2 3
+After:  [3, 1, 0, 6]
+
+Before: [0, 1, 1, 3]
+1 0 0 0
+After:  [0, 1, 1, 3]
+
+Before: [2, 3, 2, 3]
+5 0 1 3
+After:  [2, 3, 2, 3]
+
+Before: [3, 0, 2, 1]
+2 3 2 0
+After:  [3, 0, 2, 1]
+
+Before: [2, 3, 3, 1]
+3 3 1 0
+After:  [1, 3, 3, 1]
+
+Before: [2, 2, 3, 3]
+15 1 2 2
+After:  [2, 2, 4, 3]
+
+Before: [1, 2, 1, 1]
+9 3 1 1
+After:  [1, 1, 1, 1]
+
+Before: [1, 3, 1, 1]
+3 3 1 1
+After:  [1, 1, 1, 1]
+
+Before: [1, 3, 0, 1]
+9 0 1 3
+After:  [1, 3, 0, 1]
+
+Before: [0, 1, 3, 2]
+2 3 1 2
+After:  [0, 1, 3, 2]
+
+Before: [1, 3, 2, 3]
+0 3 2 1
+After:  [1, 2, 2, 3]
+
+Before: [0, 2, 0, 2]
+15 3 2 3
+After:  [0, 2, 0, 4]
+
+Before: [0, 1, 3, 3]
+1 0 0 1
+After:  [0, 0, 3, 3]
+
+Before: [0, 2, 3, 2]
+7 2 1 1
+After:  [0, 2, 3, 2]
+
+Before: [0, 2, 3, 2]
+7 2 3 2
+After:  [0, 2, 2, 2]
+
+Before: [1, 0, 2, 1]
+2 3 2 2
+After:  [1, 0, 3, 1]
+
+Before: [1, 2, 3, 0]
+8 1 3 1
+After:  [1, 6, 3, 0]
+
+Before: [2, 3, 0, 1]
+5 0 1 2
+After:  [2, 3, 3, 1]
+
+Before: [3, 2, 2, 2]
+10 1 2 3
+After:  [3, 2, 2, 4]
+
+Before: [0, 3, 1, 2]
+8 3 3 2
+After:  [0, 3, 6, 2]
+
+Before: [3, 0, 3, 1]
+11 3 1 3
+After:  [3, 0, 3, 1]
+
+Before: [3, 3, 3, 1]
+3 3 1 0
+After:  [1, 3, 3, 1]
+
+Before: [1, 2, 3, 1]
+7 2 1 0
+After:  [2, 2, 3, 1]
+
+Before: [0, 0, 2, 0]
+4 0 2 0
+After:  [0, 0, 2, 0]
+
+Before: [0, 3, 1, 1]
+3 3 1 2
+After:  [0, 3, 1, 1]
+
+Before: [1, 1, 0, 2]
+14 2 1 0
+After:  [1, 1, 0, 2]
+
+Before: [3, 3, 1, 1]
+8 1 3 1
+After:  [3, 9, 1, 1]
+
+Before: [1, 0, 0, 1]
+6 0 3 0
+After:  [3, 0, 0, 1]
+
+Before: [0, 2, 2, 0]
+12 2 0 3
+After:  [0, 2, 2, 2]
+
+Before: [0, 2, 3, 3]
+12 3 0 0
+After:  [3, 2, 3, 3]
+
+Before: [0, 1, 2, 1]
+13 1 2 1
+After:  [0, 3, 2, 1]
+
+Before: [3, 3, 3, 0]
+0 2 2 0
+After:  [2, 3, 3, 0]
+
+Before: [0, 1, 0, 3]
+13 0 3 3
+After:  [0, 1, 0, 3]
+
+Before: [0, 1, 2, 1]
+13 0 2 2
+After:  [0, 1, 2, 1]
+
+Before: [2, 3, 2, 3]
+0 3 2 3
+After:  [2, 3, 2, 2]
+
+Before: [2, 3, 2, 0]
+5 2 1 2
+After:  [2, 3, 3, 0]
+
+Before: [2, 0, 3, 0]
+7 2 0 3
+After:  [2, 0, 3, 2]
+
+Before: [0, 3, 2, 2]
+5 2 1 2
+After:  [0, 3, 3, 2]
+
+Before: [3, 2, 1, 2]
+15 1 2 3
+After:  [3, 2, 1, 4]
+
+Before: [3, 3, 3, 1]
+3 3 1 1
+After:  [3, 1, 3, 1]
+
+Before: [0, 1, 0, 3]
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+After:  [0, 1, 0, 3]
+
+Before: [3, 3, 3, 1]
+3 3 1 3
+After:  [3, 3, 3, 1]
+
+Before: [2, 1, 3, 0]
+13 0 1 1
+After:  [2, 3, 3, 0]
+
+Before: [3, 1, 2, 2]
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+After:  [3, 1, 2, 2]
+
+Before: [0, 0, 2, 1]
+1 0 0 2
+After:  [0, 0, 0, 1]
+
+Before: [0, 2, 3, 1]
+2 3 2 3
+After:  [0, 2, 3, 3]
+
+Before: [2, 0, 3, 0]
+4 1 0 0
+After:  [0, 0, 3, 0]
+
+Before: [2, 0, 3, 2]
+7 2 3 3
+After:  [2, 0, 3, 2]
+
+Before: [2, 2, 2, 1]
+12 2 0 3
+After:  [2, 2, 2, 2]
+
+Before: [3, 1, 0, 2]
+6 1 2 2
+After:  [3, 1, 3, 2]
+
+Before: [1, 0, 3, 0]
+11 0 1 0
+After:  [1, 0, 3, 0]
+
+Before: [0, 3, 1, 3]
+12 3 1 1
+After:  [0, 3, 1, 3]
+
+Before: [2, 1, 0, 1]
+14 2 1 0
+After:  [1, 1, 0, 1]
+
+Before: [2, 0, 0, 1]
+11 3 1 1
+After:  [2, 1, 0, 1]
+
+Before: [1, 1, 3, 0]
+0 2 2 0
+After:  [2, 1, 3, 0]
+
+Before: [2, 0, 3, 2]
+0 2 2 0
+After:  [2, 0, 3, 2]
+
+Before: [1, 3, 0, 3]
+9 0 1 1
+After:  [1, 1, 0, 3]
+
+Before: [0, 3, 0, 0]
+1 0 0 2
+After:  [0, 3, 0, 0]
+
+Before: [2, 1, 2, 2]
+2 3 1 1
+After:  [2, 3, 2, 2]
+
+Before: [1, 2, 3, 0]
+10 0 2 0
+After:  [3, 2, 3, 0]
+
+Before: [2, 2, 1, 2]
+6 0 1 0
+After:  [3, 2, 1, 2]
+
+Before: [3, 2, 2, 3]
+0 0 2 1
+After:  [3, 2, 2, 3]
+
+Before: [2, 3, 2, 1]
+3 3 1 2
+After:  [2, 3, 1, 1]
+
+Before: [2, 3, 3, 2]
+15 0 2 2
+After:  [2, 3, 4, 2]
+
+Before: [0, 2, 3, 3]
+7 2 1 0
+After:  [2, 2, 3, 3]
+
+Before: [1, 0, 2, 3]
+12 3 1 0
+After:  [3, 0, 2, 3]
+
+Before: [2, 3, 2, 3]
+5 2 1 0
+After:  [3, 3, 2, 3]
+
+Before: [1, 3, 0, 3]
+9 0 1 2
+After:  [1, 3, 1, 3]
+
+Before: [0, 1, 2, 2]
+12 2 2 0
+After:  [2, 1, 2, 2]
+
+Before: [1, 1, 2, 3]
+12 3 1 2
+After:  [1, 1, 3, 3]
+
+Before: [0, 2, 0, 1]
+9 3 1 2
+After:  [0, 2, 1, 1]
+
+Before: [3, 1, 1, 2]
+2 3 1 1
+After:  [3, 3, 1, 2]
+
+Before: [3, 3, 2, 1]
+3 3 1 0
+After:  [1, 3, 2, 1]
+
+Before: [3, 0, 3, 0]
+6 1 2 1
+After:  [3, 2, 3, 0]
+
+Before: [3, 1, 0, 1]
+8 1 2 0
+After:  [2, 1, 0, 1]
+
+Before: [3, 1, 1, 0]
+14 3 1 2
+After:  [3, 1, 1, 0]
+
+Before: [0, 0, 2, 0]
+13 3 2 3
+After:  [0, 0, 2, 2]
+
+Before: [1, 0, 2, 1]
+11 3 1 2
+After:  [1, 0, 1, 1]
+
+Before: [0, 1, 3, 0]
+14 3 1 1
+After:  [0, 1, 3, 0]
+
+Before: [0, 1, 0, 2]
+13 0 1 2
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