Factorials

The factorial of a positive integer n is the product of all positive integers less than or equal to n.

You’re given a number and you have to calculate it’s factorial.

Note: Factorial of 1 = 1, Factorial of 0 = 1

Try doing it in both recursive and iterative method

Input Format

First Parameter - Number n

Output Format

Return the number

Example 1:

Input : 4
Output : 24

Constraints

• 0<=n<=10