**num = int(input())**

**factorial = 1**

**# check if the number is negative, positive or zero**

**if num < 0:**

** print("Sorry, factorial does not exist for negative numbers")**

**elif num == 0:**

** print("The factorial of 0 is 1")**

**else:**

** for i in range(1,num + 1):**

** factorial = factorial*i**

** print("The factorial of",num,"is",factorial) **