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#include <iostream>
#define ULL unsigned long long

using namespace std;

inline ULL power(ULL num)
{
	ULL res = 0;
	ULL tmp;

	while (num)
	{
		tmp = num % 10;
		num /= 10;
		res += tmp*tmp;
	}

	return  res;
}


int main()
{
	ULL a, b, k;
	ios::sync_with_stdio(false);
	cin >> k >> a >> b;

	if (a < k)
		a = k;
	else
		a -= (a % k) - k;


	ULL counter = 0;

	for (ULL i = a; i <= b; i += k)
	{
		if (power(i) == i / k)
			++counter;
	}

	cout << counter;
	return 0;
}