diff --git a/day3/input.txt b/day3/input.txt
new file mode 100644
index 0000000..602049b
--- /dev/null
+++ b/day3/input.txt
@@ -0,0 +1,6 @@
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diff --git a/day3/run.py b/day3/run.py
new file mode 100644
index 0000000..eb4e4c7
--- /dev/null
+++ b/day3/run.py
@@ -0,0 +1,52 @@
+import re
+
+# EXAMPLE = "xmul(2,4)%&mul[3,7]!@^do_not_mul(5,5)+mul(32,64]then(mul(11,8)mul(8,5))"
+EXAMPLE = "xmul(2,4)&mul[3,7]!^don't()_mul(5,5)+mul(32,64](mul(11,8)undo()?mul(8,5))"
+
+INST_RE = re.compile(r"(mul\(\d+,\d+\)|do\(\)|don't\(\))")
+
+
+class ParseInstructions:
+    """Parse instructions and get results"""
+
+    def __init__(self, input: str):
+        self.input = input
+        self.instructions = INST_RE.findall(self.input)
+
+    def __str__(self) -> str:
+        return f"Part 1 = {self._part1}, Part 2 = {self._part2}"
+
+    def _mul(self, inst: str) -> int:
+        vars = re.findall(r"\d+", inst)
+        return int(vars[0]) * int(vars[1])
+
+    @property
+    def _part1(self):
+        outp = 0
+        for inst in self.instructions:
+            if inst.startswith("mul"):
+                outp += self._mul(inst)
+        return outp
+
+    @property
+    def _part2(self):
+        outp = 0
+        enabled = True
+        for inst in self.instructions:
+            if inst.startswith("don't"):
+                enabled = False
+            elif inst.startswith("do"):
+                enabled = True
+            elif inst.startswith("mul") and enabled:
+                outp += self._mul(inst)
+        return outp
+
+
+if __name__ == "__main__":
+    example = ParseInstructions(EXAMPLE)
+    print(example)
+    assert example._part1 == 161
+    assert example._part2 == 48
+    with open("input.txt", "r") as f:
+        puzzle = ParseInstructions(f.read())
+        print(puzzle)