diff --git a/d09.py b/d09.py
new file mode 100755
index 0000000..f047020
--- /dev/null
+++ b/d09.py
@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+from sys import argv
+
+i = [int(x.strip()) for x in open(argv[1])]
+
+pre = 25
+if len(argv) > 2:
+    pre = int(argv[2])
+
+for x in range(pre, len(i)):
+    n = i[x]
+    for y in i[x-pre:x]:
+        if n-y in i[x-pre:x]:
+            break
+    else:
+        print(n)
+        for y in range(len(i)):
+            p = y
+            c = 0
+            while p < len(i):
+                c += i[p]
+                if c == n:
+                    r = i[y:p+1]
+                    print(min(r)+max(r))
+                    break
+                if c > n:
+                    break
+                p += 1
+            if c == n:
+                break
+        break
diff --git a/d09_input.txt b/d09_input.txt
new file mode 100644
index 0000000..ead4f19
--- /dev/null
+++ b/d09_input.txt
@@ -0,0 +1,1000 @@
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diff --git a/d09_output.txt b/d09_output.txt
new file mode 100644
index 0000000..229932a
--- /dev/null
+++ b/d09_output.txt
@@ -0,0 +1,2 @@
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