diff --git a/16/4 - Digital Root.py b/16/4 - Digital Root.py
new file mode 100644
index 0000000..803bcaa
--- /dev/null
+++ b/16/4 - Digital Root.py	
@@ -0,0 +1,5 @@
+def digitalRoot(n):
+   if n<10:
+      return n
+   else:
+      return digitalRoot(digitalSum(n))