Super Ugly Number

easy
1. Write a program to find the nth super ugly number.
 2. Super ugly numbers are positive numbers whose all prime factors are in the given prime list primes of size k.
 3. 1 is a super ugly number for any given primes.
 
 Input: n = 12, primes = [2,7,13,19]
 Output: 32 
 Explanation: [1,2,4,7,8,13,14,16,19,26,28,32] is the sequence of the first 12 
 super ugly numbers given primes = [2,7,13,19] of size 4.

Input Format

First line contains integer n. Second line contains an integer L(size of the primes array) Third line ccontains L prime numbers.

Output Format

Return an integer

Constraints

The given numbers in primes are in ascending order.
 0 < k <= 100, 0 < n <= 106, 0 < primes[i] < 1000.
 The nth super ugly number is guaranteed to fit in a 32-bit signed integer.

Notice

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Example

Input
12
4
2 7 13 19
Output
32
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