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#include <cstdlib>
#include <iostream>
#include <string.h>
#include <algorithm>
#include <math.h>
#include <functional>
#include <set>

using namespace std;

long long SumaKwadratow(long long n)
        {
            long long sumaKw = 0;
            while (n != 0)
            {
                sumaKw += (n%10) * (n% 10);
                n /= 10;
            }
            return sumaKw;
        }

int main()
{
	long long a,b,k,result=0;
	ios_base::sync_with_stdio(0);
    cin >> k >> a>> b;        

    for (long long fn = 0; fn <= 1459; fn++) // max wartosc dla fn to 1459 (9^2*18 + 1)
    {
        long long  n = fn * k; //dla badanej wartosci fn i zalozonego k, n musi miec taka wartosc

        //sprawdzam czy spelnione sa warunki zadania
        if (n>=a && n<=b && k<n && k*SumaKwadratow(n)==n)
        {
            result++;
        }
    }

	cout << result << "\n";
	
	return 0;
}