全是TLE...

#include<iostream>
using namespace std;
int f(long long n) {
	long long sum = 0;
	while (n) {
		sum += (n % 10) * (n % 10);
		n /= 10;
	}
	return sum;
}
int main() {
	long long k, a, b;
	cin >> k >> a >> b;
	long long cnt = 0;
	for (long long i = a;i <= b;i++) {
		if (k * f(i) == i) cnt++;
	}
	cout << cnt;
	return 0;
}