diff --git a/NOD b/NOD
new file mode 100644
index 0000000..cd35d33
--- /dev/null
+++ b/NOD
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+a=$1
+b=$2
+
+while [ $b -ne 0 ]
+do
+    temp=$b
+    b=$((a % b))
+    a=$temp
+done
+
+echo $a