Problem B
The Gourmet

The French gourmet Frank is a very well-respected gourmet; his job involves going around to various restaurants, eating their food and then writing a review about the restaurant. But he carries a dark secret: he is actually only interested in eating as much as possible and in any order!

However, Frank understands that a true gourmet can’t eat in just any manner, like starting with his dessert and finishing with a salad. Therefore, he asks for your help in constructing a list with all the different ways he could arrange his courses during a meal, so that he can pick the best order.

During the serving, Frank has $M$ minutes to eat. The restaurant offers $N$ different courses, and he can eat any number of servings of each course. For course $i$, it takes $T_i$ minutes to eat a serving of it. Frank wants to eat something during each of the $M$ minutes he has, and he wants to finish every course that he is served. He never wants to start eating a new course until he finished the last one.

Your task is to write a program to compute the number of ways he could arrange his meal, given these restrictions.

Input

The first line contains an integer $M$ ($1\le M\le 1000$), the number of minutes.

The second line contains an integer $N$ ($1\le N\le 30$), the number of courses.

Afterwards, $N$ lines follow with an integer $T_i$ ($1\le T_i\le 200$) on each line, the time it takes to eat every dish.

Output

The program should output the number of ways in which Frank can eat during exactly $M$ minutes.

The answer will always be at most 2 billion ($2000000000$).

Scoring

Your solution will be tested on a set of test case groups. To get the points for a group, you need to pass all the test cases in the group.

Scoring

Your program will be tested on $5$ test cases. For each test cases you pass, you will get $20$ points.

For test cases worth $60$ points, the answer will be less than $2$ million ($2000000$).

Explanation of Sample $1$

Frank is going to eat during $10$ minutes and have two courses to choose from, for example a salad (takes $3$ minutes to eat) and pie ($7$ minutes). There are only two ways he can eat them: first pie and then salad or vice versa. If he only eats salad he will either finish too quickly ($3\text{ servings}=9\text{ minutes}$) or too late ($4\text{ servings}=12\text{ minutes}$).

10
2
7
3

2

12
6
1
3
3
5
6
12

498