diff --git a/day_7/input.txt b/day_7/input.txt
new file mode 100644
index 0000000000000000000000000000000000000000..74d32f019010bb764ba027ec0395593b7a4de181
--- /dev/null
+++ b/day_7/input.txt
@@ -0,0 +1,4 @@
+3,8,1001,8,10,8,105,1,0,0,21,34,51,76,101,114,195,276,357,438,99999,3,9,1001,9,3,9,1002,9,3,9,4,9,99,3,9,101,4,9,9,102,4,9,9,1001,9,5,9,4,9,99,3,9,1002,9,4,9,101,3,9,9,102,5,9,9,1001,9,2,9,1002,9,2,9,4,9,99,3,9,1001,9,3,9,102,2,9,9,101,4,9,9,102,3,9,9,101,2,9,9,4,9,99,3,9,102,2,9,9,101,4,9,9,4,9,99,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,1001,9,2,9,4,9,3,9,101,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,99,3,9,101,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,2,9,4,9,3,9,1001,9,2,9,4,9,99,3,9,1001,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,101,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,1,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,99,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,1002,9,2,9,4,9,3,9,102,2,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,101,1,9,9,4,9,3,9,102,2,9,9,4,9,3,9,102,2,9,9,4,9,99,3,9,1002,9,2,9,4,9,3,9,101,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,101,2,9,9,4,9,3,9,101,1,9,9,4,9,3,9,1001,9,2,9,4,9,3,9,1002,9,2,9,4,9,3,9,1001,9,1,9,4,9,3,9,1001,9,2,9,4,9,3,9,1002,9,2,9,4,9,99
+3,31,3,32,1002,32,10,32,1001,31,-2,31,1007,31,0,33, 1002,33,7,33,1,33,31,31,1,32,31,31,4,31,99,0,0,0
+3,23,3,24,1002,24,10,24,1002,23,-1,23, 101,5,23,23,1,24,23,23,4,23,99,0,0
+3,15,3,16,1002,16,10,16,1,16,15,15,4,15,99,0,0
diff --git a/day_7/main.py b/day_7/main.py
new file mode 100644
index 0000000000000000000000000000000000000000..f551d04559e1101b1ecf44a06c49cc78acbbf568
--- /dev/null
+++ b/day_7/main.py
@@ -0,0 +1,112 @@
+"""Day 7: Amplification Circuit."""
+
+from itertools import permutations
+
+def get_codes():
+ with open("input.txt") as f:
+ return [int(num) for num in f.readline().strip().split(",")]
+
+
+def get_opcode(opcode):
+ tmp = int(opcode)
+ op = tmp % 100
+ tmp //= 100
+ h = tmp % 10
+ tmp //= 10
+ k = tmp % 10
+ tmp //= 10
+ t = tmp % 10
+
+ if op in (1, 2, 7, 8):
+ t = 1
+ if op in (3,):
+ h = 1
+
+ return (h, k, t), op
+
+
+def get_next_command(ip, codes):
+ parm_counts = {1: 3, 2: 3, 3: 1, 4: 1, 5: 2, 6: 2, 7: 3, 8: 3, 99: 0}
+ modes, op = get_opcode(codes[ip])
+
+ params = [0, 0, 0]
+ ip += 1
+ for x in range(parm_counts[op]):
+ params[x] = codes[ip]
+ if modes[x] == 0:
+ params[x] = codes[params[x]]
+ ip += 1
+
+ return ip, op, params
+
+
+def exec_command(ip, op, params, codes, inputs, output):
+ if op == 1: # add
+ codes[params[2]] = params[0] + params[1]
+ elif op == 2: # multiply
+ codes[params[2]] = params[0] * params[1]
+ elif op == 3: # inout
+ # val = int(input("Enter input val? "))
+ val = inputs.pop(0)
+ codes[params[0]] = val
+ elif op == 4: # output
+ # print(f"Output value = ({params[0]})")
+ output = params[0]
+ elif op == 5: # branch true
+ if params[0] != 0:
+ ip = params[1]
+ elif op == 6: # branch false
+ if params[0] == 0:
+ ip = params[1]
+ elif op == 7: # less than
+ if params[0] < params[1]:
+ codes[params[2]] = 1
+ else:
+ codes[params[2]] = 0
+ elif op == 8: # equals
+ if params[0] == params[1]:
+ codes[params[2]] = 1
+ else:
+ codes[params[2]] = 0
+ elif op == 99: # halt
+ ip = -1
+ else:
+ print(f"Bad Op Code {op}")
+ ip = -1
+
+ return ip, output
+
+
+def run_program(codes, inputs, output):
+ ip = 0
+ while ip != -1:
+ ip, op, params = get_next_command(ip, codes)
+ ip, output = exec_command(ip, op, params, codes, inputs, output)
+ return output
+
+def main():
+ """Drive the program."""
+ inputs = list(permutations(range(5)))
+
+ # inputs = [(2,0,3, 0, 1,0,0,0,4,0)]
+ # print (inputs[:10])
+ # return
+ max = -1
+ sig = []
+ seq = []
+ for series in inputs:
+ output = 0
+ l = iter(series)
+ out = []
+ for _ in range(5):
+ codes = get_codes()
+ output = run_program(codes, [next(l), output], output)
+
+ if output > max:
+ max = output
+ sig = series
+ seq = output
+ print(f'Max({max}), Signal({sig}) Out({seq})')
+
+if __name__ == "__main__":
+ main()