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import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class row {
	public static long k,a,b;
	
	public static void odczytajLinie(){
		BufferedReader buffer=new BufferedReader(new InputStreamReader(System.in));
		try {
			String line=buffer.readLine();
			String[] stringTab = line.split(" ");
			k = Long.parseLong(stringTab[0]);
			a = Long.parseLong(stringTab[1]);
			b = Long.parseLong(stringTab[2]);
			buffer.close();
		} catch (IOException e) {
			e.printStackTrace();
		}
	}
	
	public static long sumujKwadraty(long n){
		return n == 0 ? 0 : (n%10)*(n%10) + sumujKwadraty(n/10);
	}
	
	public static boolean rozwiazujeRownanie(long k, long n){
		return k*sumujKwadraty(n) == n;
	}
	
	public static long wykonajZadanie(long k, long a, long b){
		long licznik = 0;
		for(long n = a; n<=b; n++){
		    if(rozwiazujeRownanie(k, n)){
		    	licznik++;
		    }
		}
		return licznik;
	}
	
	public static void main(String[] args) {
		odczytajLinie();		
		System.out.println(wykonajZadanie(k, a, b));
	}
}