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#include <stdlib.h>
#include <stdio.h>

long long f(long long number)
{
	long long result = 0;
	while (number > 0)
	{
		int digit = number % 10;
		number /= 10;
		result += digit * digit;
	}
	return result;
}

int main(int argc, char* argv[])
{
	if (argc < 4) return -1;

	int k, cnt = 0;
	long long int a;
	long long int b;
	long long int n;

	k = atoi(argv[1]);
	a = atoll(argv[2]);
	b = atoll(argv[3]);

	while (a < b)
	{
		n = a;
 
		if (k * f(n) == n)
		{
			cnt++;
		}
		a++;
	}

	printf("%d", cnt);
	return 0;
}