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#include <iostream>

using namespace std;

unsigned int k = 0;
unsigned int a = 0;
unsigned int b = 0;

int squares[]
{
	0, 1, 4, 9, 16, 25, 36, 49, 64, 72
};

int main()
{
	cin >> k >> a >> b;
	//k = 51;
	//k = 51;
	//a = 1;
	//b = 1000000000000; //12

	long long int result = 0;

	for (unsigned int n = a; n <= b; n++)
	{
		unsigned int n_tmp = n;
		unsigned int f_result = 0;
		while (n_tmp != 0)
		{
			f_result += squares[(n_tmp % 10)];
			n_tmp = n_tmp / 10;
		}


		if (f_result*k == n) result++;
	}
	cout << result;
	return 0;
}