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#include <iostream>
#include <cmath>

using std::cout;
using std::cin;

inline long int oblicz_kwadraty_cyfr_dla_n(long long int n)
{
	unsigned int suma = 0;

	while(n > 0)
	{
		suma += pow(n % 10, 2);
		n /= 10;
	}

	return suma;
}

int main()
{
	long long int k, a, b, n;
	unsigned int wynik = 0;

	cin >> k >> a >> b;

	while(a < b)
	{
		if(k * oblicz_kwadraty_cyfr_dla_n(a) == a) wynik += 1;
		++a;
	}

	cout << wynik;
	return 0;
}