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Problems

The cut number

The cut number

Time limit 1 second
Memory limit 128 MiB

Vasylko wrote a number which is multiple of d on a scrap of paper. His smaller brother Dmytro cut the number into k parts. Vasylko decided to restore the number that he wrote. He remembered only number d. But there was a problem. It is possible to make many numbers which are multiple of d.

How many numbers multiple of d can make Vasylko? He must use all parts to make a number.

Input data

First line contains two integers d and k (1k < 9, 1d100). The parts of the number are given in the next k lines. The number of digits in each part does not exceed 10.

Output data

Print the amount of different numbers, divisible by d.

Examples

Input example #1
5 3
13
85
45
Output example #1
4