diff --git a/src/sum_function.py b/src/sum_function.py
new file mode 100644
index 0000000..098a949
--- /dev/null
+++ b/src/sum_function.py
@@ -0,0 +1,14 @@
+# add numbers first n natural numbers ❌
+result = 0
+n = 10000000
+
+# OK code but Slow 🐌
+for i in range(1,n+1):
+    result = result + i
+print(result)
+
+# using builtin sum function ✅ - faster⚡and smaller
+print(sum(range(1,n+1)))
+
+# sum() can also be used to calculate sum of list,tuples
+print(sum([2,4,6,8,10,23,432]))