n,k = gets.chomp.split(" ").map(&:to_i)
a = gets.chomp.split(" ").map(&:to_i)
count = 0
(0..(n-1)).each do |d|
  if(a[d] != (d+1))
    count += 1 
    a[a[d]-1] = a[d]
  end
end
puts ((k - (count))%2 == 0)? "YES" : "NO"