diff --git a/2020/18/18.py b/2020/18/18.py
new file mode 100644
index 0000000..9149039
--- /dev/null
+++ b/2020/18/18.py
@@ -0,0 +1,64 @@
+def read_file():
+	with open("input.txt","r") as f:
+		return f.read().split('\n')
+
+import re
+
+def compute(problem):
+	"""Add and multiply at the same precedence."""
+	problem = problem.replace(" ","")
+	# handle parens
+	if s := re.search(r'(\((\d+)(([+*])(\d+))+\))',problem):
+		expr = s.groups()[0]
+		recurser = str(compute(s.groups()[0][1:-1]))
+		problem = problem.replace(expr, recurser, 1)
+		return compute(problem)
+	# handle ops
+	if s := re.match(r"(\d+)([+*])(\d+)", problem):
+		a, op, b = s.groups()
+		expr = s.group()
+		reducer = str(
+			int(a) + int(b)
+			if op == "+"
+			else int(a) * int(b)
+			)
+		problem = problem.replace(expr, reducer, 1)
+		return compute(problem)
+	return int(problem)
+
+def compute2(problem):
+	"""Add, then multiply."""
+	problem = problem.replace(" ","")
+	# handle parens
+	if s := re.search(r'(\((\d+)(([+*])(\d+))+\))',problem):
+		expr = s.groups()[0]
+		recurser = str(compute2(s.groups()[0][1:-1]))
+		problem = problem.replace(expr, recurser, 1)
+		return compute2(problem)
+	# handle add
+	if s := re.search(r"(\d+)\+(\d+)", problem):
+		expr = s.group()
+		print(s.groups()[1])
+		reducer = str(int(s.groups()[0]) + int(s.groups()[1]))
+		problem = problem.replace(expr, reducer, 1)
+		return compute2(problem)
+	# handle multiply
+	if s := re.match(r"(\d+)\*(\d+)", problem):
+		expr = s.group()
+		reducer = str(int(s.groups()[0]) * int(s.groups()[1]))
+		problem = problem.replace(expr, reducer, 1)
+		return compute2(problem)
+	return int(problem)
+
+def part1(problems):
+	return sum([compute(problem) for problem in problems])
+
+def part2(problems):
+	return sum([compute2(problem) for problem in problems])
+
+def main():
+	problems = read_file()
+	print(part1(problems), part2(problems))
+
+if __name__ == "__main__":
+	main()
\ No newline at end of file
diff --git a/2020/18/input.txt b/2020/18/input.txt
new file mode 100644
index 0000000..f8777b6
--- /dev/null
+++ b/2020/18/input.txt
@@ -0,0 +1,375 @@
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\ No newline at end of file