N,K = map(int,input().split())
D = list(map(int,input().split()))
cnt = 0
for i in range(N):
	if D[i] != i + 1:
		cnt+=1
def check():
	if cnt <= 2:
		return (K - cnt//2) % 2 == 0
	else:
		if cnt % 2 == 0:
			return (K - cnt // 2) % 2 == 0
		else:
			return (K - (cnt // 2 + 1)) % 2 == 0

if check():
	print('YES')
else:
	print('NO')