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

public class row {

	public static void main(String[] args) {
//		long k = Long.parseLong(args[0]);
//		long a = Long.parseLong(args[1]);
//		long b = Long.parseLong(args[2]);
		
		BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
	    String s = null;
	    try {
			s = in.readLine();
		} catch (IOException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		String[] parts = s.split(" ");
	    
		long k = Long.parseLong(parts[0]);
		long a = Long.parseLong(parts[1]);
		long b = Long.parseLong(parts[2]);

		//		System.err.println("k="+k);
//		System.err.println("a="+a);
//		System.err.println("b="+b);
//		System.err.println("min=a/k="+(a/k));
		
		int count = 0;
		long min;
		if (a % k != 0) {
			min = (a / k) + 1;
		} else {
			min = a / k;
		}
		
		for(long i = min; i <= b / k; i++) {
			long n=i*k;
			int sum = 0;
//			System.err.println("n_" + i + "="+n);
			do {
				int digit = (int) (n % 10);
//				System.err.println(digit);
				sum += digit * digit; 
				n=n/10;
			} while(n > 0);
			
			if (sum == i) {
//				System.err.println("n_" + i + "="+n);
				count++;
			}
		}
		
//		System.err.println("count=" + count);
		System.out.println(count);
		System.exit(0);
	}

}