diff --git a/2022/day11.py b/2022/day11.py
new file mode 100644
index 0000000..6701e18
--- /dev/null
+++ b/2022/day11.py
@@ -0,0 +1,68 @@
+from helpers import *
+from math import prod, lcm
+
+input_stripped = read_day(day)
+monkeys_input = [m.split('\n') for m in input_stripped.split('\n\n')]
+# monkeys_input = [[l.strip() for l in m.split('\n')] for m in input_stripped.split('\n\n')]
+num_regex = re.compile(r'(\d+)')
+op_regex = re.compile(r'Operation: (new = .*)')
+
+def generate_monkeys(split_input):
+    monkeys = {}
+    for monkey in monkeys_input:
+        m = {
+            'id': int(num_regex.findall(monkey[0])[0]),
+            'items': [int(x) for x in num_regex.findall(monkey[1])],
+            'operation': op_regex.findall(monkey[2])[0],
+            'test_divisor': int(num_regex.findall(monkey[3])[0]),
+            'true_monkey': int(num_regex.findall(monkey[4])[0]),
+            'false_monkey': int(num_regex.findall(monkey[5])[0]),
+            'inspections': 0,
+        }
+        monkeys[m['id']] = m
+    return monkeys
+
+def calculate_monkey_business(monkeys):
+    inspections = [m['inspections'] for m in monkeys.values()]
+    print(inspections)
+    return prod(sorted(inspections)[-2:])
+
+# Part 1
+monkeys = generate_monkeys(monkeys_input)
+for round in range(20):
+    for monkey in monkeys.values():
+        for item in monkey['items']:
+            worry = item
+            old = worry
+            new = 0
+            exec(monkey['operation'])
+            worry = new // 3
+            if worry % monkey['test_divisor'] == 0:
+                monkeys[monkey['true_monkey']]['items'].append(worry)
+            else:
+                monkeys[monkey['false_monkey']]['items'].append(worry)
+            monkey['inspections'] += 1
+        monkey['items'] = []
+print(f'Part 1: {calculate_monkey_business(monkeys)}')
+
+# Part 2
+monkeys = generate_monkeys(monkeys_input)
+# divisor = prod([m['test_divisor'] for m in monkeys.values()])
+divisor = lcm(*[m['test_divisor'] for m in monkeys.values()])
+print(f'Using modular arithmetic of base: {divisor}')
+
+for round in range(10000):
+    for monkey in monkeys.values():
+        for item in monkey['items']:
+            worry = item
+            old = worry
+            new = 0
+            exec(monkey['operation'])
+            worry = new % divisor
+            if worry % monkey['test_divisor'] == 0:
+                monkeys[monkey['true_monkey']]['items'].append(worry)
+            else:
+                monkeys[monkey['false_monkey']]['items'].append(worry)
+            monkey['inspections'] += 1
+        monkey['items'] = []
+print(f'Part 2: {calculate_monkey_business(monkeys)}')
diff --git a/2022/input/11 b/2022/input/11
new file mode 100644
index 0000000..2e2bd25
--- /dev/null
+++ b/2022/input/11
@@ -0,0 +1,55 @@
+Monkey 0:
+  Starting items: 50, 70, 89, 75, 66, 66
+  Operation: new = old * 5
+  Test: divisible by 2
+    If true: throw to monkey 2
+    If false: throw to monkey 1
+
+Monkey 1:
+  Starting items: 85
+  Operation: new = old * old
+  Test: divisible by 7
+    If true: throw to monkey 3
+    If false: throw to monkey 6
+
+Monkey 2:
+  Starting items: 66, 51, 71, 76, 58, 55, 58, 60
+  Operation: new = old + 1
+  Test: divisible by 13
+    If true: throw to monkey 1
+    If false: throw to monkey 3
+
+Monkey 3:
+  Starting items: 79, 52, 55, 51
+  Operation: new = old + 6
+  Test: divisible by 3
+    If true: throw to monkey 6
+    If false: throw to monkey 4
+
+Monkey 4:
+  Starting items: 69, 92
+  Operation: new = old * 17
+  Test: divisible by 19
+    If true: throw to monkey 7
+    If false: throw to monkey 5
+
+Monkey 5:
+  Starting items: 71, 76, 73, 98, 67, 79, 99
+  Operation: new = old + 8
+  Test: divisible by 5
+    If true: throw to monkey 0
+    If false: throw to monkey 2
+
+Monkey 6:
+  Starting items: 82, 76, 69, 69, 57
+  Operation: new = old + 7
+  Test: divisible by 11
+    If true: throw to monkey 7
+    If false: throw to monkey 4
+
+Monkey 7:
+  Starting items: 65, 79, 86
+  Operation: new = old + 5
+  Test: divisible by 17
+    If true: throw to monkey 5
+    If false: throw to monkey 0