N,K = map(int,input().split())
L = list(map(int,input().split()))
j = 0
for i,k in enumerate(L):
	if L[k - 1] == i + 1:
		j = j + 1
	if k == i + 1:
		j = j + 1
j = j // 2
if K < N - 1 - j:
	print("NO")
else:
	K = K - N + j
	if K % 2 == 0:
		print("YES")
	else:
		print("NO")