# -*- coding: utf-8 -*-

N,K = map(int, input().split())
D = list(map(int, input().split()))

c1 = 0
c2 = 0
for i,d in zip(range(1,N+1), D):
    if i!=d:
        if i!=D[d-1]:
            c1 += 1
        else:
            c2 += 1
total = c1 + c2//2

if (K-total)%2==0:
    print('YES')
else:
    print('NO')