P9423 [AtCoder] AtCoder Grand Contest 043 - Merge Triplets
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题目描述

Given is a positive integer N. Find the number of permutations $(P_1,P_2,\cdots,P_{3N})$ of $(1,2,\cdots,3N)$ that can be generated through the procedure below. This number can be enormous, so print it modulo a prime number M.

  • Make $N sequences A_1,A_2,\cdots,A_N$ of length 3 each, using each of the integers 1 through 3N exactly once.
  • Let P be an empty sequence, and do the following operation 3N times.
  • Among the elements that are at the beginning of one of the sequences A_i that is non-empty, let the smallest be x.
  • Remove x from the sequence, and add x at the end of P.

Constraints

  • $1 \leq N \leq 2000$
  • $10^8 \leq M \leq 10^9+7$
  • M is a prime number.
  • All values in input are integers.

Input

Input is given from Standard Input in the following format:

N M

Output

Print the number of permutations modulo M.

Examples

Input

1 998244353

Output

6

Input

2 998244353

Output

261

Input

314 1000000007

Output

182908545

输入格式

见题面

输出格式

见题面

样例输入
314 1000000007
样例输出
182908545