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import java.io.OutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.util.StringTokenizer;
import java.io.IOException;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.InputStream;

/**
 * Built using CHelper plug-in
 * Actual solution is at the top
 */
public class row {
    public static void main(String[] args) {
        InputStream inputStream = System.in;
        OutputStream outputStream = System.out;
        InputReader in = new InputReader(inputStream);
        PrintWriter out = new PrintWriter(outputStream);
        ROW solver = new ROW();
        solver.solve(1, in, out);
        out.close();
    }

    static class ROW {
        private static final long MAX = 1000000000000000000L;

        public void solve(int testNumber, InputReader in, PrintWriter out) {
            long k = in.nextLong();
            long a = in.nextLong();
            long b = in.nextLong();

            int ans = 0;
            for (int f = 0; f <= 18 * 81; f++) {
                //f = n/k
                if (f <= MAX / k) {
                    long N = f * k;

                    if (a <= N && N <= b && fun(N) == f) {
                        ans++;
                    }
                }
            }
            out.println(ans);
        }

        private int fun(long n) {
            int ans = 0;
            while (n > 0) {
                long d = n % 10;
                ans += d * d;
                n /= 10;
            }
            return ans;
        }

    }

    static class InputReader {
        public BufferedReader reader;
        public StringTokenizer tokenizer;

        public InputReader(InputStream stream) {
            reader = new BufferedReader(new InputStreamReader(stream), 32768);
            tokenizer = null;
        }

        public String next() {
            while (tokenizer == null || !tokenizer.hasMoreTokens()) {
                try {
                    tokenizer = new StringTokenizer(reader.readLine());
                } catch (IOException e) {
                    throw new RuntimeException(e);
                }
            }
            return tokenizer.nextToken();
        }

        public long nextLong() {
            return Long.parseLong(next());
        }

    }
}