diff --git a/2015/day-4/input.txt b/2015/day-4/input.txt
new file mode 100644
index 0000000..922d9e6
--- /dev/null
+++ b/2015/day-4/input.txt
@@ -0,0 +1 @@
+bgvyzdsv
\ No newline at end of file
diff --git a/2015/day-4/part-1.py b/2015/day-4/part-1.py
new file mode 100644
index 0000000..ae2f5e5
--- /dev/null
+++ b/2015/day-4/part-1.py
@@ -0,0 +1,15 @@
+import os
+import hashlib
+
+file_path = os.path.join(os.path.dirname(__file__), "./input.txt")
+# file_path = os.path.join(os.path.dirname(__file__), "./test-input.txt")
+input = open(file_path).read().strip()
+
+
+number = 0
+while True:
+    result = hashlib.md5((input + str(number)).encode()).hexdigest()
+    if result.startswith("00000"):
+        print(number)
+        break
+    number += 1
diff --git a/2015/day-4/part-2.py b/2015/day-4/part-2.py
new file mode 100644
index 0000000..7c4bfb0
--- /dev/null
+++ b/2015/day-4/part-2.py
@@ -0,0 +1,15 @@
+import os
+import hashlib
+
+file_path = os.path.join(os.path.dirname(__file__), "./input.txt")
+# file_path = os.path.join(os.path.dirname(__file__), "./test-input.txt")
+input = open(file_path).read().strip()
+
+
+number = 0
+while True:
+    result = hashlib.md5((input + str(number)).encode()).hexdigest()
+    if result.startswith("000000"):
+        print(number)
+        break
+    number += 1
diff --git a/2015/day-4/test-input.txt b/2015/day-4/test-input.txt
new file mode 100644
index 0000000..d96dc95
--- /dev/null
+++ b/2015/day-4/test-input.txt
@@ -0,0 +1 @@
+abcdef
\ No newline at end of file