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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <cstdio>
#include <iostream>
#include <algorithm>
using namespace std;

int main(){
    // 引数の受け取り
    long long  N,K;
    cin >> N >> K;
    long long A[N];

    for (long long i =0 ; i < N ;i++){
       cin >> A[i];
    }

    long long mod = 1000000007;
    long long ans1 =0;
    long long ans2 =0;
    long long ans =0;
    long long o = K*(K-1)/2;
    for(long long i = 0;i<N;i++){
        ans1 =0;
        ans2 =0;
        for (long long j= 0;j<N;j++){
            if(A[i]>A[j]){
                ans1++;//ブロックにあるかず
                if(i<j){
                    ans2++;// →にあるかず
                }
            }
        }
        ans = (ans + ans1 * o % mod)% mod;
        ans = (ans + ans2 * K % mod) % mod;
    }
    //printf("%d",(((ans2*K%mod)+(ans1*K*(K-1)/2 % mod))%mod));
    cout << ans << endl;

    return 0;
}