Loops - Trailing Zeroes

using System;

class TrailingZeroes
{
    static void Main(string[] args)
    {
        //Option 1
        bool successParse;
        int enteredN;
        decimal valueN = 1;

        do
        {
            Console.Write("Enter N: ");
            successParse = int.TryParse(Console.ReadLine(), out enteredN);

        } while (!successParse);

        for (int i = 1; i <= enteredN; i++)
        {
            valueN = valueN * i;
        }

        Console.WriteLine("The factoriel is: {0}", valueN);

        int counter = 0;

        do
        {

            if (valueN % 10 == 0)
            {
                counter++;
            }

            else
            {
                break;
            }

            valueN = valueN / 10;

        } while (true);

        Console.WriteLine("The trailig zeroes are: {0}", counter);
    }
}