program main
  implicit none
  integer::N,i,j,idou,total,upper
  integer,allocatable::A(:),B(:)
  read *,N
  allocate(A(1:N),B(1:N))
  read *,A
  total = SUM(A)
  idou = 10000
  upper = MIN(INT(SQRT(DBLE(total+1))),(N+1)/2)

  do i=1, upper
     do j=1,i
        B(j) = dim(A(j),j)
     end do
     do j=i+1,N
        B(j) = dim(A(j),dim(2*i,j))
     end do
     idou = MIN(idou,SUM(ABS(B)))
  end do

  print '(i0)',idou
end program main