n, k = map(int, input().split())
D = list(map(int, input().split()))

D = [d-1 for d in D]

c = 0
for i, d in enumerate(D):
    if i != d:
        c += 1
c //= 2
if k-c >= 0 and (k-c)%2 == 0:
    print('YES')
else:
    print('NO')