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
if c == 0:
    if k%2 == 0:
        print('YES')
    else:
        print('NO')
else:
    if (k-(c-1))%2 == 0:
        print('YES')
    else:
        print('NO')