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#include <iostream>

using namespace std;

typedef unsigned long long ull;
typedef long long ll;

const ll LB = 1;
const ll HB = 9 * 9 * 18;

int main() {
	ios_base::sync_with_stdio(false);

	ll k, a, b;
	cin >> k >> a >> b;
	int res = 0;

	ll lb = a / k;
	if (lb * k < a) {
		++lb;
	}

	ll hb = b / k;
	if (hb > HB) {
		hb = HB;
	}

	ll kf, kfr;
	ll ir;
	for (ll i = lb; i <= hb; ++i) {
		kf = k * i;
		ir = 0;
		while (kf) {
			kfr = kf % 10;
			ir += kfr * kfr;
			kf /= 10;
		}
		if (ir == i) {
			++res;
		}

	}

	cout << res << endl;

	return 0;
}