program main
  implicit none
  integer*8::N,K,i,j,count,tmp
  integer*8,allocatable::D(:)
  data count/0/
  read *,N,K
  allocate(D(N))
  read *,D

  do i=1, N-1
     do j=1, N-i
        if(D(j).gt.D(j+1)) then
           tmp = D(j+1)
           D(j+1) = D(j)
           D(j) = tmp
           count = count + 1
        end if
     end do
  end do
  if(count .gt. K ) then
     print '("NO")'
  else if(MOD(count,2).eq.MOD(K,2)) then
     print '("YES")'
  else
     print '("NO")'
  end if
end program main