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#include <iostream>
#include <math.h>

using namespace std;

unsigned int sumOfSquares(unsigned int n)
{
	unsigned int sum = 0;
	while (n>0)
	{
		int digit = n%10;
		sum += digit*digit;
		n /= 10;
	}
	return sum;
}

int main()
{
	unsigned int k, a, b;
	cin >> k >> a >> b;
	a = ceil((double)a/k)*k;
	unsigned int result = 0;
	for (unsigned int i = a; i <= b; i += k)
		if (sumOfSquares(i)*k == i)
			result++;
	cout << result << endl;
	return 0;
}