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

def sort(d):
    cnt = 0
    for i in range(len(d)):
        if d[i] == i + 1:
            continue
        for j in range(i, len(d)):
            if d[j] == i + 1:
                d[i], d[j] = d[j], d[i]
                cnt += 1
                break

    return cnt

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