diff --git a/a/b/c/1.txt b/a/b/c/1.txt
deleted file mode 100644
index e69de29..0000000
diff --git a/sum.py b/sum.py
new file mode 100644
index 0000000..d8c1336
--- /dev/null
+++ b/sum.py
@@ -0,0 +1,5 @@
+def sum(a,b):
+    return a-b
+
+
+print(sum(2,4))