Trailing Zeroes in Nth Factorial

/* Write a program that calculates with how many zeroes the factorial
 * of a given number n has at its end.
 * Your program should work well for very big numbers, e.g. n=100000. */

import java.util.Scanner;

public class _18_TrailingZeroesInN_Factorial {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner scan = new Scanner(System.in);
        System.out.print("Enter a positive Integer number: ");
        int numN = scan.nextInt();
        scan.close();

        if (numN > 0) {
            int countZeroes = 0;
            while (numN > 4) {
                numN /= 5;
                countZeroes += numN;
            }

            System.out.printf("The Count Zeroes in that N-Factorial is: %d !\n",
                    countZeroes);
        } else {
            System.out.println("Error! - Invalid Input number!!!");
        }
    }

}