diff --git a/fact.py b/fact.py
new file mode 100644
index 0000000..a0a9cd9
--- /dev/null
+++ b/fact.py
@@ -0,0 +1,15 @@
+def fact(n):
+
+	if n < 0:
+		return("Error, factorial function is not defined for negative values")
+	if n == 0:
+		return 1
+
+	return n*fact(n-1)
+
+try:
+	n = int(raw_input("Enter your number to factorize: "))
+	print(fact(n))
+
+except ValueError:
+	print("You must enter an integer number!")