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import java.util.*;

public class row {

	public static void main(String[] args) {
		Scanner s = new Scanner(System.in);
		String line = s.nextLine();
		String[] arg = line.split(" ");
		long k = Long.parseLong(arg[0]);
		long a = Long.parseLong(arg[1]);
		long b = Long.parseLong(arg[2]);
		long temp = a;
		int count = 0;
		if (temp < k) temp = k;
		if (temp % k != 0){
			long l = temp / k;
			temp = (l + 1) * k;
		}
		while (temp % k != 0){
			
			temp++;
		}
		long div = temp / k;
		
		while (temp <= b){
			long square = squareDigits(temp);
			if (k * square == temp){
				//System.out.println(temp + " " + square + " " + k);
				count++;
			}
			temp += k;
			div++;
			if (div > 1600) break;
		}
		System.out.println(count);
		System.exit(0);
	}
	
	public static long squareDigits(long l){
		long ret = 0L;
		String s = String.valueOf(l);
		//System.out.println(s);
		char[] t = s.toCharArray();
		for (int i = 0; i < t.length; i++){
			int digit = (int)t[i] - (int)'0';
			ret += digit * digit;
		}
		return ret;
	}

}