import math

_, k = tuple(int(x) for x in input().split())
darr = [int(x) for x in input().split()]


dcnt = 0

for i in range(len(darr)):
    if darr[i] != i + 1:
        dcnt += 1


if (k - math.ceil(dcnt / 2)) % 2 == 0:
    print("YES")
else:
    print("NO")