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#include <iostream>
using namespace std;

bool isRight(unsigned long long a, unsigned long long k);

int main()
{
	ios_base::sync_with_stdio(0);
	unsigned long long k;
	unsigned long long a;
	unsigned long long b;
	int n = 0;
	cin >> k;
	cin >> a;
	cin >> b;
	unsigned long long minnumb = (a / k);
	if (a % k != 0)
	{
		minnumb++;
	}
	if (minnumb > 1458)
	{
		minnumb = 1458;
	}
	unsigned long long maxnumb = (b / k);
	if (maxnumb > 1458)
	{
		maxnumb = 1458;
	}
	for (unsigned long long i = minnumb; i <= maxnumb; i++)
	{
		if (isRight(i, k))
		{
			n++;
		}
	}
	cout << n;
	return 0;
}

bool isRight(unsigned long long a, unsigned long long k)
{
	unsigned long long b = a * k;
	while (b != 0)
	{
		int c = b % 10;
		a -= c * c;
		b /= 10;
	}
	if (a == 0)
	{
		return true;
	}
	else
	{
		return false;
	}
}