n,k=gets.split.map{|e| e.to_i}
x=gets.split.map{|e| e.to_i-1}
hs={}
i=0
n.times{|i|
	while x[i]!=i
		t=x[i]
		x[i]=x[t]
		x[t]=t
		k-=1
	end
}
if k<0
	puts "NO"
elsif k%2==0
	puts "YES"
else
	puts "NO"
end