diff --git a/03/03.py b/03/03.py
new file mode 100644
index 0000000..d5dfd8a
--- /dev/null
+++ b/03/03.py
@@ -0,0 +1,21 @@
+import re
+
+
+data = open("input.txt").read().strip()
+
+def mul(a, b):
+    return a*b
+
+print(sum(eval(x) for x in re.findall("mul\(\d{1,3},\d{1,3}\)", data)))
+
+q = "mul\(\d{1,3},\d{1,3}\)|do\(\)|don't\(\)"
+f = True
+s = 0
+for x in re.findall(q, data):
+    if x=='do()':
+        f = True
+    elif x=='don\'t()':
+        f = False
+    elif f:
+        s += eval(x)
+print(s)