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

public class row {

	public static void main(String[] args) throws IOException {
		
		row solver = new row();
		solver.init();
		solver.solve();
	}
	
	private void init() {
		
	}
	
	private void solve() throws IOException { 
		Reader in = new Reader(System.in);
		PrintWriter out = new PrintWriter(new BufferedOutputStream(System.out));
		
		long k = in.nextLong();
		long a = in.nextLong();
		long b = in.nextLong();
		
		int r = 0;
		
		for (int sum = 0; sum < 1500; sum++) {
			long n = k * sum;
			if (n > b) break;
			if (n < a) continue;
			if (sum == countSum(n)) r++;
		}
		out.println(r);
		out.flush();
		out.close();
	}
	
	private int countSum(long n) {
		if (n == 0) return 0;
		int d = (int)(n % 10);
		return d * d + countSum(n/10);
	}

	private static class Reader {
	    BufferedReader reader;
	    StringTokenizer tokenizer;

	    /** call this method to initialize reader for InputStream */
	    Reader(InputStream input) {
	        reader = new BufferedReader(
	                     new InputStreamReader(input) );
	        tokenizer = new StringTokenizer("");
	    }

	    public void skipLine() throws IOException {
			reader.readLine();
		}

		/** get next word */
	    public String next() throws IOException {
	        while ( ! tokenizer.hasMoreTokens() ) {
	            //TODO add check for eof if necessary
	            tokenizer = new StringTokenizer(
	                   reader.readLine() );
	        }
	        return tokenizer.nextToken();
	    }

	    public int nextInt() throws IOException {
	        return Integer.parseInt( next() );
	    }
	    
	    public double nextDouble() throws IOException {
	        return Double.parseDouble( next() );
	    }
	    
	    public long nextLong() throws IOException {
	    	return Long.parseLong(next());
	    }
	}
}