Extra long factorials code in C#

Code World Technology

Problem source: https://www.hackerrank.com/challenges/extra-long-factorials

You are given an integer N. Print the factorial of this number.

N!=N×N1×N2××3×2×1

Note: Factorials of N>20 can’t be stored even in a 64bit long long variable. Big integers must be used for such calculations. Languages like Java, Python, Ruby etc. can handle big integers but we need to write additional code in C/C++ to handle such large values.

We recommend solving this challenge using BigIntegers.

Input Format
Input consists of a single integer N.

Constraints
1N100

Output Format
Output the factorial of N.

Sample Input

25

Sample Output

15511210043330985984000000

class Extra_Long_Factorials_Hackerrank
{
static void Main(string[] args)
{
int N = Convert.ToInt16(Console.ReadLine());
Console.WriteLine(Factorials(N));
}

private static BigInteger Factorials(int N)
{
if (N == 1)
{

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