diff --git a/factorial.py b/factorial.py
new file mode 100644
index 0000000..f65f3f4
--- /dev/null
+++ b/factorial.py
@@ -0,0 +1,13 @@
+class Solution:
+    def factorial(self, num):
+        if num == 0 or num == 1:
+            return 1
+        else:
+            return num * s.factorial(num-1)  # 5 * 4!
+
+
+if __name__ == '__main__':
+    number = int(input("Enter number : "))
+    s = Solution()
+    s.factorial(number)
+    print(f"The factorial of {number} is { s.factorial(number)}")
\ No newline at end of file