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#include<iostream>

using namespace std;

long long k;

long long result(long long num){
	long long res = 0;
	int cyfra;

	while (num > 0){
		cyfra = num % 10;
		num /= 10;
		res = cyfra*cyfra + res;
	}

	return res;
}

bool check(long long num){
	if (num == result(num)*k)
		return true;
	return false;
}



int main(){

	long long a, b;
	int numbers = 0;

	cin >> k >> a >> b;

	for (long long i = a; i <= b; ++i){
		if (i%k==0){
		if (check(i)) numbers++;
              }
	}

	cout << numbers << endl;
	return 0;
}