import math

if __name__ == '__main__':
    n, k = map(int, input().split())
    ds = list(map(int, input().split()))

    cnt = sum(1 for i, d in enumerate(ds) if d != i + 1)
    t = math.ceil(cnt / 2)

    print("YES" if (k - t) % 2 == 0 else "NO")