n, k = [int(i) for i in input().split()]
d = [int(i) for i in input().split()]

cnt = 0
for i in range(len(d)):
    if d[i] != i + 1:
        cnt += 1

if cnt % 2 == 0 and k % 2 == 1:
    print('YES')
else:
    print('NO')