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#include <iostream>
using namespace std;

long sumkwa(long x) {
	long sum = 0;
	while (x > 0) {
		sum += (x % 10)*(x % 10);
		x /= 10;
	}
	return sum;
}

int main() {
	const long MAX = 18 * 81;
	long k;
	long a;
	long b;

	cin >> k;
	cin >> a;
	cin >> b;

	long cnt = 0;

	for (long i = a/k; i <= MAX; ++i) {
		if (i <= b/k && k*sumkwa(k*i) == k*i && k*i >= a && k*i <= b) {
			++cnt;
		}
	}

	cout << cnt << endl;

	return 0;
}