diff --git a/2015/04/solve.py b/2015/04/solve.py
new file mode 100644
index 0000000..8af9aae
--- /dev/null
+++ b/2015/04/solve.py
@@ -0,0 +1,33 @@
+import hashlib
+
+# PART 1
+
+def leading_zeroes(amount, start):
+	n = 1
+	what = "0"*amount
+	while True:
+		text = (start + str(n)).encode("utf-8")
+		h = hashlib.md5(text).hexdigest()
+		if h[:amount] == what:
+			return n
+
+		if n % 100000 == 0:
+			print(f"{n:9} {text} {h}")
+
+		n += 1
+
+# PART 2
+
+def main(hashstart):
+	print("Previously calculated:")
+	print("Part 1: 282749")
+	print("Part 2: 9962624")
+	print()
+	print(f"Solutions")
+	n = leading_zeroes(5, hashstart)
+	print(f"Part 1: {n}")
+	n_2 = leading_zeroes(6, hashstart)
+	print(f"Part 2: {n_2}")
+
+if __name__ == "__main__":
+	main("yzbqklnj")