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#include <bits/stdc++.h>
using namespace std;

int main() {
	int ans = 0;
	long long k, a, b;
	cin >> k >> a >> b;
	for(int i = 1; k * i <= b && i <= 2000; i++) {
		if(a <= k * i) {
			long long tmp = k * i;
			int sum = 0;
			while(tmp) {
				sum += ((tmp % 10) * (tmp % 10));
				tmp /= 10;
			}
			if(sum == i) ans++;
		}
	}
	cout << ans;
}