FactorielZeros

using System;

class FactorielZeros
{
    static void Main()
    {
        Console.Write("n = ");
        int n = int.Parse(Console.ReadLine());
        int j = 5;
        int nulls = 0;
        for (int i = 1; j > 1 ; i++)
        {
            j = n/ (int)Math.Pow(5 , i);
            nulls += j;
        }
        Console.WriteLine("In {0}! have {1} nulls" , n , nulls);
    }
}