import sys
#input = sys.stdin.readline
#input = sys.stdin.buffer.readline #文字列はダメ
#sys.setrecursionlimit(1000000)
#import bisect
#import itertools
#import random
#from heapq import heapify, heappop, heappush
#from collections import defaultdict 
#from collections import deque
#import copy
#import math
#from functools import lru_cache
#@lru_cache(maxsize=None)
#MOD = pow(10,9) + 7
#MOD = 998244353
#dx = [1,0,-1,0]
#dy = [0,1,0,-1]
#dx8 = [1,1,0,-1,-1,-1,0,1]
#dy8 = [0,1,1,1,0,-1,-1,-1]

class BIT:
    def __init__(self, n):
        self.n = n
        self.data = [0]*(n+1)
 
    def to_sum(self, i):
        s = 0
        while i > 0:
            s += self.data[i]
            i -= (i & -i)
        return s
 
    def add(self, i, x):
        while i <= self.n:
            self.data[i] += x
            i += (i & -i)
 
    def get(self, i, j):
        return self.to_sum(j)-self.to_sum(i-1)

def main():
    N,K = map(int,input().split())
    D = list(map(int,input().split()))
    Tree = BIT(N)

    inversion_number = 0
    for i in range(N):
        #自分以下で既に出てきた数字(i.e.左側にある数字)を引く。
        inversion_number += i - Tree.to_sum(D[i]) #BITは1-indexだがDも1-index
        Tree.add(D[i],1) #出てきた数字を記録

    if inversion_number > K:
        print('NO')
    elif (inversion_number - K)%2 == 0:
        print('YES')
    else:
        print('NO')

if __name__ == '__main__':
    main()