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#include <iostream>
#include <cstdio>

int getDigitsSquaredSum(long long int num) {
	int result = 0;
	while (num) {
		result += (num % 10) * (num % 10);
		num /= 10;
	}
	return result;
}

int main() {
	long long int k, a, b;
	scanf("%lld%lld%lld", &k, &a, &b);

	int result = 0;
	for (int j = 1; j <= 81 * 18; j++) {
		if (getDigitsSquaredSum(k * j) == j && a <= k * j && k * j <= b) {
			result++;
		}
	}
	printf("%d", result);

	return 0;
}