N,K=map(int,input().split())
D=[int(x)-1 for x in input().split()]
for i in range(N):
 while D[i]!=i:
  j=D[i]
  D[i],D[j]=D[j],D[i]
  K-=1
print('YNEOS'[K<0 or K%2!=0::2])