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#include <iostream>
#include <stdint.h>

using namespace std;

int main() {
	ios_base::sync_with_stdio(false);
	int64_t k, a, b;
	int64_t res = 0;

	cin >> k >> a >> b;
	while(a <= b) {
		int64_t t = a;
		int64_t sum = 0;
		while(t > 0) {
			sum += (t%10)*(t%10);
			t = t/10;
		}
		if(sum * k == a) {
			res++;
			a += k;
		} 
		else a++;
	}

	cout << res << "\n";
}