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import java.util.Iterator;
import java.util.Scanner;

/**
 * Created by gmatuszewski on 25.09.2015.
 */
public class row {

	public static void main(String[] args) {
		final Scanner sc = new Scanner(System.in);
		Iterator<String> it = new Iterator<String>() {
			@Override
			public boolean hasNext() {
				return sc.hasNextLine();
			}

			@Override
			public String next() {
				return sc.nextLine();
			}
		};

		int res = row(it);

		System.out.println(res);
		System.exit(0);
	}

	public static int row(Iterator<String> iter){
		String[] args = iter.next().split(" ");

		long k = Long.parseLong(args[0]);
		long a = Long.parseLong(args[1]);
		long b = Long.parseLong(args[2]);

		long start = Math.max(k, a);
		long end = Math.min(1500 * k, b);

		if (start % k != 0){
			start += k - (start % k);
		}

		int sum = 0;
		for (long i = start; i <= end; i += k ){
			if( i == f(i) * k)
				sum++;
		}

		return sum;
	}

	private static long f(long i) {
		long sum = 0;
		while ( i > 0 ){
			sum += (i % 10) * (i % 10);
			i = i / 10;
		}
		return sum;
	}
}