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// Krzysztof Jędraszek
#include <iostream>

using namespace std;

unsigned long long k, b, n;

int suma_kwa(unsigned long long n) {
	int sum=0;
	while(n!=0){
		sum = sum + (n%10)*(n%10);
		n=n/10;
	}
	return sum;
}

int main()
{
	short licznik = 0;
	ios_base::sync_with_stdio(0);
	cin >> k >> n >> b; 
	if (n%k == 0) {
		while (n <= b) {
			if (k*suma_kwa(n) == n) { 
				licznik++; 
			}
			n += k; 
		}
	}
	if (n%k != 0) { 
		n = ((n / k) + 1)*k; 
		while (n <= b) {
			if (k*suma_kwa(n) == n) { 
				licznik++; 
			}
			n += k; 
		}
	}
	cout << licznik;
	return 0;
}