#include <iostream.h>

void main()
{
	long n = 0;
	long pocet = 0;
	long delitel = 5;

	while ((n<1) || (n>2000000000))
	{
		cout << "Zadejte cislo od 1 do 2000000000: ";
		cin >> n;
	}

	while (delitel <= n)
	{
		pocet += n / delitel;
		delitel *= 5;
	}

	cout << "Cislo " << n << "! ma na konci " << pocet << " nul."
		 << endl;

}