Problem:
Score : 200 points

Problem Statement

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.

Sample Input 1

15 40

Sample Output 1

10

There are 10 Product Days in a year, as follows (m-d denotes Month m, Day d):

4-22

6-23

6-32

8-24

9-33

10-25

12-26

12-34

14-27

15-35

Sample Input 2

12 31

Sample Output 2

5

Sample Input 3

1 1

Sample Output 3

0

Solution in C# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;
using System.Collections.Generic;
using System.Linq;


class Program
{
    static void Main(string[] args)
    {
        var md = Console.ReadLine().Split(' ');
        var m = int.Parse(md[0]);
        var d = int.Parse(md[1]);

        var count = 0;
        for (var i = 1; i <= m; i++)
        {
            for (var j = 22; j <= d; j++)
            {
                var tmp = j.ToString().ToCharArray();
                var d1 = int.Parse(tmp[0].ToString());
                var d2 = int.Parse(tmp[1].ToString());
                if (d1 < 2 || d2 < 2) continue;
                if (d1 * d2 == i) count++;
            }
        }

        Console.Write(count);
    }
}