Time limit per test: 0.5 second(s) Memory limit: 262144 kilobytes
input: standard output: standard
A member ai of the sequence a1, a2, ·s, an is called a if either ai > ai-1 and ai > ai+1 (local maximum) or ai < ai-1 and ai < ai+1 (local minimum). A sequence p1, p2, ·s, pn is called a of the integers from 1 to n if each of the integers appears in the sequence exactly once. A permutation is called if each member (except the first and the last) is a local extreme.
Compute the total number of extremal permutations of the integers from 1 to n and output the result modulo m.
The first and only line of the input file contains the integers n () and m (1 ≤ m ≤ 109).
The output file should contain a single integer, the remainder from division of the total number of extremal permutations of integers from 1 to n by the given integer m.
Note. The extremal permutations of 1·s3 are (1, 3, 2), (2, 1, 3), (2, 3, 1) and (3, 1, 2).
Codeforces (c) Copyright 2010-2023 Mike Mirzayanov