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#include <bits/stdc++.h>

using namespace std;

int Funct(long long int n)
{
	int res = 0;
	while(n != 0)
	{
		int ld = n % 10;
		n /= 10;
		res += ld * ld;
	}
	return res;
}

int main(int argc, char const *argv[])
{
	ios::sync_with_stdio(false);
	long long int k, a, b;
	cin >> k >> a >> b;
	int upper = 81 * 22;
	int res = 0;
	for (int i = 0; i < upper; ++i)
	{
		long long int n = k * (long long int)i;
		if (n / k != i) break;
		if (a <= n && b >= n && Funct(n) == i)
		{
			res++;
			//cerr << n << endl;
		}
	}
	cout << res << endl;
	return 0;
}