def f(s):
    return int(s)-1

from sympy.combinatorics import Permutation

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

p=Permutation(D)
L=len(p.transpositions())

if (L<=K) and ((K-L)%2==0):
    print("YES")
else:
    print("NO")