Today is August 24, one of the five Product Days in a year.

A date m-d (m is the month, d is the date) is called a Product Day when d is a two-digit number, and all of the following conditions are satisfied (here d_{10} is the tens digit of the day and d_1 is the ones digit of the day):

* d_1 \geq 2
* d_{10} \geq 2
* d_1 \times d_{10} = m



Takahashi wants more Product Days, and he made a new calendar called Takahashi Calendar where a year consists of M month from Month 1 to Month M, and each month consists of D days from Day 1 to Day D.

In Takahashi Calendar, how many Product Days does a year have?

Constraints

* All values in input are integers.
* 1 \leq M \leq 100
* 1 \leq D \leq 99

Input

Input is given from Standard Input in the following format:


M D


Output

Print the number of Product Days in a year in Takahashi Calender.

Examples

Input

15 40


Output

10


Input

12 31


Output

5


Input

1 1


Output

0
import java.util.*;

public class Main {
  public static void main(String[] args) {
    Scanner scanner = new Scanner(System.in);
    try {
      int m = scanner.nextInt();
      int d = scanner.nextInt();

      int ans = 0;
      for (int i = 1; i <= m; i++) {
        for (int j = 0; j <= d; j++) {
          if (query(j, i)) ans++;
        }
      }
      System.out.println(ans);
    } finally {
      scanner.close();
    }
  }

  private static boolean query(int d, int m) {
    int d1 = d % 10;
    int d10 = (d % 100) / 10;
    return d1 >= 2 && d10 >= 2 && d1 * d10 == m; 
  }
}
