TrailingZeroes

using System;
using System.Numerics;

class TrailingZeroesInN
{
    static void Main()
    {
        Console.Write("n=");
        BigInteger n = BigInteger.Parse(Console.ReadLine());
        BigInteger factN = 1;
        for (int i = 1; i <= n; i++)
        {
            factN *= i;
        }
        Console.WriteLine("Factorial is: {0}", factN);
        Console.WriteLine("Number of zeros are {0}",n/5);
    }
}