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

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

cnt = count(d)
rcnt = count(list(reversed(d)))
l = len(d)
tmp = 0
if cnt == l:
    tmp = 0
elif rcnt == l:
    tmp = len(d) // 2
else:
    tmp = len(d) - 1 - cnt

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